odd man out vs odd fish

odd man out and odd fish both are nouns.

Word	Noun	Adjective	Verb	Adverb
odd man out	Yes	No	No	No
odd fish	Yes	No	No	No

As nouns, odd man out and odd fish are synonyms defined as:

odd man out and odd fish: someone regarded as eccentric or crazy and standing out from a group

Other synonyms of odd man out include kook, odd fellow, queer bird, queer duck.

odd man out (noun)	odd fish (noun)
someone regarded as eccentric or crazy and standing out from a group	someone regarded as eccentric or crazy and standing out from a group