odd man out vs kook

odd man out and kook both are nouns.

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

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

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

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

odd man out (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