sniff vs snuff

sniff and snuff both are nouns.

Word	Noun	Adjective	Verb	Adverb
sniff	Yes	No	Yes	No
snuff	Yes	Yes	Yes	No

As nouns, sniff and snuff are synonyms defined as:

sniff (noun)	snuff (noun)
sensing an odor by inhaling through the nose	sensing an odor by inhaling through the nose
	finely powdered tobacco for sniffing up the nose
	a pinch of smokeless tobacco inhaled at a single time
	the charred portion of a candlewick

sniff (adjective)	snuff (adjective)
	snuff colored; of a greyish to yellowish brown

sniff (verb)	snuff (verb)
inhale audibly through the nose	inhale (something) through the nose
perceive by inhaling through the nose	sniff or smell inquiringly