heedless vs deaf

heedless is not a noun while deaf is a noun.

Word	Noun	Adjective	Verb	Adverb
heedless	No	Yes	No	No
deaf	Yes	Yes	Yes	No

heedless (noun)	deaf (noun)
	people who have severe hearing impairments

heedless (adjective)	deaf (adjective)
marked by or paying little heed or attention	lacking or deprived of the sense of hearing wholly or in part
characterized by careless unconcern	(usually followed by `to') unwilling or refusing to pay heed

heedless (verb)	deaf (verb)
	make or render deaf