slow vs slack

slow is not a noun while slack is a noun.

slow and slack both are adjectives.

slow and slack both are verbs.

slow is an adverb but slack is not an adverb.

Word	Noun	Adjective	Verb	Adverb
slow	No	Yes	Yes	Yes
slack	Yes	Yes	Yes	No

As verbs, slow and slack are synonyms defined as:

slow and slack: become slow or slower

Other synonyms of slow include slacken, slow down, slow up.

slow (noun)	slack (noun)
	a cord or rope or cable that is hanging loosely
	the quality of being loose (not taut)
	a stretch of water without current or movement
	a soft wet area of low-lying land that sinks underfoot
	a noticeable deterioration in performance or quality
	dust consisting of a mixture of small coal fragments and coal dust and dirt that sifts out when coal is passed over a sieve

slow (adjective)	slack (adjective)
not moving quickly; taking a comparatively long time	not tense or taut
at a slow tempo	lacking in rigor or strictness
(used of timepieces) indicating a time earlier than the correct time	flowing with little speed as e.g. at the turning of the tide
(of business) not active or brisk
slow to learn or understand; lacking intellectual acuity
so lacking in interest as to cause mental weariness

slow (verb)	slack (verb)
lose velocity; move more slowly	release tension on
become slow or slower	make less active or fast
cause to proceed more slowly	make less active or intense
	become slow or slower
	cause to heat and crumble by treatment with water
	become less in amount or intensity
	be inattentive to, or neglect
	avoid responsibilities and work, be idle

slow (adverb)	slack (adverb)
without speed (`slow' is sometimes used informally for `slowly')
showing a time that is earlier than the actual time

Difference between slow and slack

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