stinky vs malodourous

stinky and malodourous both are adjectives.

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

As adjectives, stinky and malodourous are synonyms defined as:

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

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