allophone vs phoneme

allophone and phoneme both are nouns.

Word	Noun	Adjective	Verb	Adverb
allophone	Yes	No	No	No
phoneme	Yes	No	No	No

As nouns, phoneme is a hypernym of allophone; that is, phoneme is a word with a broader meaning than allophone:

allophone: (linguistics) any of various acoustically different forms of the same phoneme
phoneme: (linguistics) one of a small set of speech sounds that are distinguished by the speakers of a particular language

allophone (noun)	phoneme (noun)
(linguistics) any of various acoustically different forms of the same phoneme	(linguistics) one of a small set of speech sounds that are distinguished by the speakers of a particular language