slackness vs remissness

slackness and remissness both are nouns.

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

As nouns, slackness and remissness are synonyms defined as:

Other synonyms of slackness include laxity, laxness.

slackness (noun)	remissness (noun)
the quality of being loose (not taut)	the quality of being lax and neglectful
the quality of being lax and neglectful
weakness characterized by a lack of vitality or energy