malodourous vs ill-smelling

malodourous and ill-smelling both are adjectives.

Word	Noun	Adjective	Verb	Adverb
malodourous	No	Yes	No	No
ill-smelling	No	Yes	No	No

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

Other synonyms of malodourous include malodorous, stinky, unpleasant-smelling.

malodourous (adjective)	ill-smelling (adjective)
having an unpleasant smell	having an unpleasant smell