heaving vs panting

heaving and panting both are nouns.

Word	Noun	Adjective	Verb	Adverb
heaving	Yes	No	No	No
panting	Yes	No	No	No

As nouns, heaving and panting are synonyms defined as:

heaving (noun)	panting (noun)
throwing something heavy (with great effort)	breathing heavily (as after exertion)
breathing heavily (as after exertion)	any fabric used to make trousers
the act of lifting something with great effort
an upward movement (especially a rhythmical rising and falling)