broken vs imperfect

broken is not a noun while imperfect is a noun.

Word	Noun	Adjective	Verb	Adverb
broken	No	Yes	No	No
imperfect	Yes	Yes	No	No

broken (noun)	imperfect (noun)
	a tense of verbs used in describing action that is on-going

broken (adjective)	imperfect (adjective)
physically and forcibly separated into pieces or cracked or split	not perfect; defective or inadequate
not continuous in space, time, or sequence or varying abruptly	wanting in moral strength, courage, or will; having the attributes of man as opposed to e.g. divine beings
(especially of promises or contracts) having been violated or disregarded
out of working order (`busted' is an informal substitute for `broken')
destroyed financially
thrown into a state of disarray or confusion
discontinuous
subdued or brought low in condition or status
weakened and infirm
imperfectly spoken or written
lacking a part or parts
topographically very uneven
tamed or trained to obey