The IPA symbol /ʌ/ name is "open-mid back unrounded vowel" and the IPA vowel trapezoid shows it as the unrounded version of /ɔ/, but its sound in English sounds very different from [ɔ] to me. It sounds to me identical to [ɜ] (open-mid central unrounded vowel). Am I listening right? If so, why are 2 different IPA symbols used for identical sounds?
Example: [ɜ] in search [sɜ:t͡ʃ] (RP English) (https://en.m.wiktionary.org/wiki/search) vs [ʌ] in butter [bʌɾɚ] (https://en.m.wiktionary.org/wiki/butter). I would compare the GA English pronunciation of "search" but I have been already told that ɜ is pronounced differently in that word in GA English.