odorous vs scent

odorous is not a noun while scent is a noun.

Word	Noun	Adjective	Verb	Adverb
odorous	No	Yes	No	No
scent	Yes	No	Yes	No

odorous (noun)	scent (noun)
	any property detected by the olfactory system
	an odor left in passing by which a person or animal can be traced
	a distinctive odor that is pleasant

odorous (adjective)	scent (adjective)
having odor or a characteristic odor
having a natural fragrance
emitting an odor