strangling vs asphyxiation

strangling and asphyxiation both are nouns.

Word	Noun	Adjective	Verb	Adverb
strangling	Yes	No	No	No
asphyxiation	Yes	No	No	No

As nouns, asphyxiation is a hypernym of strangling; that is, asphyxiation is a word with a broader meaning than strangling:

Other hypernyms of strangling include suffocation.

strangling (noun)	asphyxiation (noun)
the act of suffocating (someone) by constricting the windpipe	killing by depriving of oxygen
	the condition of being deprived of oxygen (as by having breathing stopped)