odd fellow vs queer duck

odd fellow and queer duck both are nouns.

Word	Noun	Adjective	Verb	Adverb
odd fellow	Yes	No	No	No
queer duck	Yes	No	No	No

As nouns, odd fellow and queer duck are synonyms defined as:

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

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

odd fellow (noun)	queer duck (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