abatement vs remission

abatement and remission both are nouns.

Word	Noun	Adjective	Verb	Adverb
abatement	Yes	No	No	No
remission	Yes	No	No	No

As nouns, remission is a hyponym of abatement; that is, remission is a word with a more specific, narrower meaning than abatement:

abatement: an interruption in the intensity or amount of something
remission: an abatement in intensity or degree (as in the manifestations of a disease)

Other hyponyms of abatement include defervescence, remittal, subsidence.

abatement (noun)	remission (noun)
the act of abating	the act of absolving or remitting; formal redemption as pronounced by a priest in the sacrament of penance
an interruption in the intensity or amount of something	(law) the act of remitting (especially the referral of a law case to another court)
	an abatement in intensity or degree (as in the manifestations of a disease)
	a payment of money sent to a person in another place