slackness vs looseness

slackness and looseness both are nouns.

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

As nouns, looseness is a hypernym of slackness; that is, looseness is a word with a broader meaning than slackness:

Other hypernyms of slackness include play.

slackness (noun)	looseness (noun)
the quality of being loose (not taut)	dissolute indulgence in sensual pleasure
the quality of being lax and neglectful	movement or space for movement
weakness characterized by a lack of vitality or energy	a lack of strict accuracy; laxity of practice
	freedom from restraint
	the quality of movability by virtue of being free from attachment or other restraints
	frequent and watery bowel movements; can be a symptom of infection or food poisoning or colitis or a gastrointestinal tumor