I've realized I don't actually understand the difference between ɑ and ʌ completely.

Background: I'm a Hebrew speaker.

for me, the ʌ is pretty much the short Hebrew Kamatz sound (Bet with kamatz - בָ).
To my impression, the ɑ sound is like the Long Kamatz sound but tainted with a little bit of Holam sound (Gimel with Holam - גֹ).

So, to my impression, the differences are:

  1. ʌ is always short, while the ɑ is always long.
  2. ʌ is pure "uh sound" (Kamatz) while ɑ is tainted with a bit of "Oh sound" (Holam)

Some guides online explain that the difference between ʌ and ɑ is the length only, they're both an "uh" sound.

It's a bit awkward to me, as the American pronunciation of "not" is not exactly "nʌʌt", but the vowel is a bit tainted with an "o" sound (but again, I maybe hear what I want to hear).

Hearing the both sounds in online dictionaries - well, for me, they're not the same. again, I might be hearing what I want to hear.

so, is ɑ sound simply a prolonged ʌ sound or aside length, they are different?

  • To a first approximation, I'd say the sound represented by ɑ simply doesn't occur in English (to the extent that it does, it's just peculiar to certain dialectal accents). I think your question might be more suited to linguistics.SO Commented Sep 10, 2017 at 15:51
  • 3
    doesn't occur in english? what about father, gone and many many more? it occurs a lot, at least in american english.
    – David Haim
    Commented Sep 10, 2017 at 15:53
  • I speak English English, so things like the cot-caught merger don't really affect me. Commented Sep 10, 2017 at 15:57
  • 1
    OK. but you do realize by the tags that this question is about American english, right?
    – David Haim
    Commented Sep 10, 2017 at 15:57
  • Yes, but I still think this is a linguistics question,. not something particularly relevant to ELU. Perhaps it might also be suitable on English Language Learners Commented Sep 10, 2017 at 15:58

1 Answer 1


It's hard to answer this question for a few reasons:

  • the difference between /ɑ/ and /ʌ/ is different in different accents of American English

  • I'm not personally familar with Hebrew, so I can only go on sound files that I might listen to, and the descriptions that I have read. I haven't been able to find any detailed description of the phonetics of Hebrew vowels—most resources I have found just give a broad phonemic transcription of /a, e, i, o, u/, sometimes noting a few phonetic details like that Hebrew /a/ is apparently something like central [ä] rather than front [a] and /o/ is, at least in some positions, actually close-mid [o̞] rather than fully close [o].

Here's my best shot. Some of the following may be incorrect. Be aware that I am speaking from the perspective of someone with a Western US accent with the "cot-caught" merger: that is, I don't have /ɔ/ as a distinct sound in my speech, so in many words where I have /ɑ/, other speakers have /ɔ/.

In American English, phonetic vowel length is as far as I know not a very important factor in the differentiation of /ɑ/ and /ʌ/. The length of the vowels in "cud" and "cod" sound similar to me. "Cut" and "cot" have shorter vowels than "cud" and "cod" because the following consonant /t/ is voiceless. I'm not sure, the vowel in "cut" might be a bit shorter than the one in "cot", but it's nothing drastic.

There is definitely a difference in the quality of /ɑ/ and /ʌ/ in most accents. I think that the guides that you reference that say "the difference between ʌ and ɑ is the length only, they're both an "uh" sound" are incorrect. Nonetheless, the qualities are somewhat close to one another, and it's relatively common for non-native speakers to hear them as the same (or in some contexts, they may even sound close enough to be confused by native speakers: to me the vowels in "salt" /sɑlt/ and "consult" /kənˈsʌlt/ sound pretty similar).

As far as I can tell, there are two main ways in which /ɑ/ may have a different quality from /ʌ/, and some accents have one without the other:

  • in many American accents, /ɑ/ has a "lower" quality compared to /ʌ/, which may be mid or low-mid

  • in many American accents, /ɑ/ has a more "back" quality compared to /ʌ/, which has a more "central" quality. I think this is what you are hearing when you hear an "o"-like quality in /ɑ/: as far as I can tell Hebrew /a/ (kamatz) is usually realized as a central vowel while Hebrew /o/ (holam) is a back vowel.

I guess we could say that in the idealized "General American" accent, both of these qualities distinguish the two vowels.

However, depending on the accent, only on or the other of these may be true. For example, in an accent with the "Northern Cities Vowel Shift," the vowel /ɑ/ is fronted to central [ä] or even further forward, while the vowel /ʌ/ is often backed. In an accent like this, /ʌ/ is higher than /ɑ/, but not more central.

There seem to be some relevant charts in "How Can You Learn a Language that Isn't There?", by Dennis R. Preston, in English Pronunciation Models: A Changing Scene. I'll reproduce two of them here:

enter image description here

enter image description here On the other hand, there are other accents where /ɑ/ is somewhat raised towards [ɔ] (I believe this is particularly common for speakers with the cot-caught merger), and accents where /ʌ/ is somewhat lowered towards [ɐ]. While I don't know of any American English accent where both of these changes occur to an extent such that /ʌ/ is phonetically lower than /ɑ/, it wouldn't particularly surprise me to learn that such an accent exists.

So I would recommend deciding on what accent of American English you want to learn, and seeking out audio in that accent for you to listen to.

If you really want specific advice about phonetics, I'd say the following. Since I definitely know of some accents where /ʌ/ is more "back" than /ɑ/, but I don't actually know of any accent where /ʌ/ is "lower" than /ɑ/, it's probably best to focus on vowel height as the distinguishing factor and aim to produce /ʌ/ as a central-ish non-low vowel: somewhere around the quality [ə] that you will have to be familiar with anyway to use for reduced vowels in unstressed syllables. Many (although not all) American English speakers identify the quality of /ʌ/ with that of /ə/, so this should be a fairly "safe" choice. This will probably be at least somewhat "higher" than Hebrew /a/. This is pretty much the advice Geoff Lindsey gives in his blog post "STRUT for Dummies".

  • as always, great and informative answer! you should really receive a physical medal for your efforts. I actually learn and practice the notorious general American accent, this is why it's important to me to learn these differences. I guess, If I try to describe the differences again in other words - then to produce the ɑ sound, you need to produce the ʌ sound, but with the tongue stretched back and touches the part below the gums? it's like ʌ, but "way deeper in your throat"
    – David Haim
    Commented Sep 10, 2017 at 19:17
  • @DavidHaim: Hmm, describing the physical articulation of sounds in words is quite tricky, but that sounds plausible as a description of vowel height to me.
    – herisson
    Commented Sep 10, 2017 at 19:18
  • well, I guess it's gonna be a hard day tommorow for my American colleagues. I usually try to keep them away from my shenanigans, but I guess tomorrow is the "ʌ vs. ɑ" day. thank you so much!
    – David Haim
    Commented Sep 10, 2017 at 19:22
  • 1
    Distinguishing vowels by "height" is less helpful, I find, than a purely articulatory description in term of tongue shape and jaw movement.
    – Greg Lee
    Commented Sep 10, 2017 at 19:33
  • @GregLee: unfortunately, I don't know much about phonetics and especially not about articulation, so it's hard for me to figure out how to accurately describe the concrete differences between the position of the tongue and jaw in /ɑ/ and /ʌ/. I'm more comfortable talking about the abstraction of "vowel height" because there are more resources that describe the difference in this manner. I'm glad that you could help David with that!
    – herisson
    Commented Sep 10, 2017 at 20:05

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