breathe in vs sniffle

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

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

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

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

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

breathe in (verb)	sniffle (verb)
draw in (air)	inhale audibly through the nose
	cry or whine with snuffling