foul-smelling vs ill-scented

foul-smelling and ill-scented both are adjectives.

Word	Noun	Adjective	Verb	Adverb
foul-smelling	No	Yes	No	No
ill-scented	No	Yes	No	No

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

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

foul-smelling (adjective)	ill-scented (adjective)
offensively malodorous	offensively malodorous