smelly vs ill-scented

smelly and ill-scented both are adjectives.

Word	Noun	Adjective	Verb	Adverb
smelly	No	Yes	No	No
ill-scented	No	Yes	No	No

As adjectives, smelly and ill-scented are synonyms defined as:

Other synonyms of smelly include fetid, foetid, foul-smelling, foul, funky, noisome, stinking.

smelly (adjective)	ill-scented (adjective)
offensively malodorous	offensively malodorous