breathing vs breathless

breathing is a noun but breathless is not a noun.

Word	Noun	Adjective	Verb	Adverb
breathing	Yes	Yes	No	No
breathless	No	Yes	No	No

breathing (noun)	breathless (noun)
the bodily process of inhalation and exhalation; the process of taking in oxygen from inhaled air and releasing carbon dioxide by exhalation

breathing (adjective)	breathless (adjective)
passing or able to pass air in and out of the lungs normally; sometimes used in combination	not breathing or able to breathe except with difficulty
	appearing dead; not breathing or having no perceptible pulse
	tending to cause suspension of regular breathing