breathe in vs aspirate

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

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

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

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

breathe in (noun)	aspirate (noun)
	a consonant pronounced with aspiration
	a speech sound having as an obvious concomitant an audible puff of breath, as initial stop consonants or initial h -sounds.

breathe in (verb)	aspirate (verb)
draw in (air)	inhale (air, water, etc.)
	pronounce with aspiration; of stop sounds
	remove by suction