abatement vs hiatus

abatement and hiatus both are nouns.

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

As nouns, abatement and hiatus are synonyms defined as:

abatement and hiatus: an interruption in the intensity or amount of something

Other synonyms of abatement include reprieve, respite, suspension.

abatement (noun)	hiatus (noun)
the act of abating	a natural opening or perforation through a bone or a membranous structure
an interruption in the intensity or amount of something	a missing piece (as a gap in a manuscript)
	an interruption in the intensity or amount of something