stinky vs malodorous

stinky and malodorous both are adjectives.

Word	Noun	Adjective	Verb	Adverb
stinky	No	Yes	No	No
malodorous	No	Yes	No	No

As adjectives, stinky and malodorous are synonyms defined as:

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

stinky (adjective)	malodorous (adjective)
having an unpleasant smell	having an unpleasant smell
very bad