scent vs odorous

scent is a noun but odorous is not a noun.

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

scent (noun)	odorous (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

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