pong vs stink

pong and stink both are nouns.

Word	Noun	Adjective	Verb	Adverb
pong	Yes	No	No	No
stink	Yes	No	Yes	No

As nouns, stink is a hypernym of pong; that is, stink is a word with a broader meaning than pong:

Other hypernyms of pong include fetor, foetor, malodor, malodour, mephitis, reek, stench.

pong (noun)	stink (noun)
an unpleasant smell	a distinctive odor that is offensively unpleasant

pong (verb)	stink (verb)
	smell badly and offensively
	be extremely bad in quality or in one's performance