misfit vs birdbrain

misfit and birdbrain both are nouns.

Word	Noun	Adjective	Verb	Adverb
misfit	Yes	No	No	No
birdbrain	Yes	No	No	No

As nouns, birdbrain is a hyponym of misfit; that is, birdbrain is a word with a more specific, narrower meaning than misfit:

Other hyponyms of misfit include anthropoid, ape, dork, jerk, addle-head, addlehead, loon.

misfit (noun)	birdbrain (noun)
someone unable to adapt to their circumstances	a person with confused ideas; incapable of serious thought