stinky vs rotten

stinky and rotten both are adjectives.

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

As adjectives, stinky and rotten are synonyms defined as:

Other synonyms of stinky include crappy, icky, lousy, shitty, stinking.

stinky (adjective)	rotten (adjective)
having an unpleasant smell	having decayed or disintegrated; usually implies foulness
very bad	damaged by decay; hence unsound and useless
	very bad