queer duck vs kook

queer duck and kook both are nouns.

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

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

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

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

queer duck (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