choking vs suffocative

choking is a noun but suffocative is not a noun.

Word	Noun	Adjective	Verb	Adverb
choking	Yes	Yes	No	No
suffocative	No	Yes	No	No

As adjectives, choking and suffocative are synonyms defined as:

choking and suffocative: causing difficulty in breathing especially through lack of fresh air and presence of heat

Other synonyms of choking include smothering, suffocating.

choking (noun)	suffocative (noun)
the act of suffocating (someone) by constricting the windpipe
a condition caused by blocking the airways to the lungs (as with food or swelling of the larynx)

choking (adjective)	suffocative (adjective)
causing difficulty in breathing especially through lack of fresh air and presence of heat	causing difficulty in breathing especially through lack of fresh air and presence of heat