ill-smelling vs stinky

ill-smelling and stinky both are adjectives.

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

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

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

ill-smelling (adjective)	stinky (adjective)
having an unpleasant smell	having an unpleasant smell
	very bad