queer bird vs kook

queer bird and kook both are nouns.

Word	Noun	Adjective	Verb	Adverb
queer bird	Yes	No	No	No
kook	Yes	No	No	No

As nouns, queer bird and kook are synonyms defined as:

queer bird and kook: someone regarded as eccentric or crazy and standing out from a group

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

queer bird (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