malodor vs reek

malodor and reek both are nouns.

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

As nouns, malodor and reek are synonyms defined as:

Other synonyms of malodor include fetor, foetor, malodour, mephitis, stench, stink.

malodor (noun)	reek (noun)
a distinctive odor that is offensively unpleasant	a distinctive odor that is offensively unpleasant

malodor (verb)	reek (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.