remittal vs abatement

remittal and abatement both are nouns.

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

As nouns, abatement is a hypernym of remittal; that is, abatement is a word with a broader meaning than remittal:

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

Other hypernyms of remittal include hiatus, reprieve, respite, suspension.

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