smell vs scent

smell and scent both are nouns.

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

As nouns, smell and scent are synonyms defined as:

Other synonyms of smell include aroma, odor, odour, olfactory property.

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

smell: the sensation that results when olfactory receptors in the nose are stimulated by particular chemicals in gaseous form
scent: an odor left in passing by which a person or animal can be traced

Other hyponyms of smell include aroma, fragrance, perfume, fetor, foetor, malodor, malodour, mephitis, reek, stench, stink, acridity, stank.

As verbs, scent is a hyponym of smell; that is, scent is a word with a more specific, narrower meaning than smell:

Other hyponyms of smell include sniff, whiff, nose, wind, snuff, snuffle, get a noseful, get a whiff.

smell (noun)	scent (noun)
the act of perceiving the odor of something	any property detected by the olfactory system
any property detected by the olfactory system	an odor left in passing by which a person or animal can be traced
the faculty that enables us to distinguish scents	a distinctive odor that is pleasant
the sensation that results when olfactory receptors in the nose are stimulated by particular chemicals in gaseous form
the general atmosphere of a place or situation and the effect that it has on people

smell (verb)	scent (verb)
become aware of not through the senses but instinctively	apply perfume to
emit an odor	catch the scent of; get wind of
inhale the odor of; perceive by the olfactory sense	cause to smell or be smelly
smell bad
have an element suggestive (of something)