kook vs odd fish

kook and odd fish both are nouns.

Word	Noun	Adjective	Verb	Adverb
kook	Yes	No	No	No
odd fish	Yes	No	No	No

As nouns, kook and odd fish are synonyms defined as:

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

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

kook (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