odd fish vs kook

odd fish and kook both are nouns.

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

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

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

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

odd fish (noun)	kook (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