breathe in vs snuffle

breathe in is not a noun while snuffle is a noun.

Word	Noun	Adjective	Verb	Adverb
breathe in	No	No	Yes	No
snuffle	Yes	No	Yes	No

As verbs, snuffle is a hyponym of breathe in; that is, snuffle is a word with a more specific, narrower meaning than breathe in:

Other hyponyms of breathe in include aspirate, sniff, sniffle, snivel, snuff, drag, draw, puff, huff, snort.

breathe in (noun)	snuffle (noun)
	the act of breathing heavily through the nose (as when the nose is congested)

breathe in (verb)	snuffle (verb)
draw in (air)	snuff up mucus through the nose
	cry or whine with snuffling
	sniff or smell inquiringly