reek vs pong

reek and pong both are nouns.

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

As nouns, pong is a hyponym of reek; that is, pong is a word with a more specific, narrower meaning than reek:

Other hyponyms of reek include niff.

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

reek (verb)	pong (verb)
be wet with sweat or blood, as of one's face
smell badly and offensively
have an element suggestive (of something)
give off smoke, fumes, warm vapour, steam, etc.