There is a well known part of speech called "adverbs". However, many adverbs are not grammatically interchangeable with each other. From Wikipedia:

Adverbs are traditionally regarded as one of the parts of speech. However, modern linguists note that the term "adverb" has come to be used as a kind of "catch-all" category, used to classify words with various different types of syntactic behavior, not necessarily having much in common except that they do not fit into any of the other available categories (noun, adjective, preposition, etc.)

Adverbs as a "catch-all" category

  • She gave birth naturally.
  • Naturally, she gave birth. different meaning of "naturally"
  • Perry is very fast.
  • *Perry very won the race. only some adverbs can go in this position
  • The sock looks good there.
  • *It is a there beautiful sock. only some adverbs can go in this position

What can we call groups like this?

Adverbs are not always grammatically interchangeable because they are ____. This means we have to classify this word group into specific subgroups before they can be truly useful.

I'm looking for a generic term, not one specific to linguistic terminology. Noun, adjective, it doesn't matter. Feel free to completely reword the example sentence as long as the phrase is relatively simple. It would be good if the phrase could also be used as a label:

Adverbs (____)

Heterogeneous has the meaning I want (not all the members are the same, but some can be; different from all members being different), but neither it nor any of its single word synonyms are plain enough for me:

I think it's unlikely a single word will get the meaning across in a way that most people would understand, so a phrase seems more likely. The best I can come up with so far is "uneven group":

Adverbs (uneven group)

Adverbs are not always grammatically interchangeable because they are an uneven group.

  • 1
    Non-interchangeable? – Lawrence Feb 2 at 5:56
  • 1
    Could you give examples of adverbs which, in your sense, are grammatically interchangeable and those which are not? I'm struggling to understand your question. – BoldBen Feb 2 at 13:07
  • @BoldBen Done, plus a link to the Wikipedia article where the claim and the examples come from. However, don't focus on the adverbs! I want answers that focus on describing the grouping. – CJ Dennis Feb 3 at 21:25
  • The problem here starts with the word interchangeable. The collection of adverbs is very general. Not all members of the collection have the same properties. This is the general (i.e. expected) case, and as a result there is no special word to describe it, at least in plain English. – Global Charm Feb 3 at 23:17
  • In the context given I'd simply write Adverbs are not always grammatically interchangeable. This means we have to classify this word group into specific subgroups before they can be truly useful. then, having established their pesky nature you can simply call them adverbs. – High Performance Mark Feb 4 at 6:15

I just stumbled across a set of words that I think will do the job, even though they're not everyday words:

  • monophyletic
  • paraphyletic
  • polyphyletic

These words are used in descriptions of evolutionary trees: monophyletic groups of species are all species descended from the same ancestor (a complete group), paraphyletic groups are all descended from the same ancestor but are missing one or more species (an incomplete group), polyphyletic groups have traits in common that their most recent common ancestor didn't have (a mixed group).

I see no reason why these words can't be used to describe things outside of biology, so adverbs form a polyphyletic group.

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