remissness vs laxity

remissness and laxity both are nouns.

Word	Noun	Adjective	Verb	Adverb
remissness	Yes	No	No	No
laxity	Yes	No	No	No

As nouns, remissness and laxity are synonyms defined as:

Other synonyms of remissness include laxness, slackness.

remissness (noun)	laxity (noun)
the quality of being lax and neglectful	the quality of being lax and neglectful
	the condition of being physiologically lax