slack is a valid English word

Scrabble validity: valid ( international - Sowpods, US - Twl06 )
iScramble validity: valid
QuickWords validity: valid

Meanings

Noun (COUNTABLE AND UNCOUNTABLE)

(uncountable) The part of anything that hangs loose, having no strain upon it.
• the slack of a rope or of a sail
(countable) A tidal marsh or shallow that periodically fills and drains.
(uncountable psychotherapy) Unconditional listening attention given by client to patient.

Adjective (COMPARABLE)

(normally said of a rope) Lax; not tense; not firmly extended.
• a slack rope
Weak; not holding fast.
• a slack hand
Moderate in some capacity.

Adverb (NOT COMPARABLE)

Slackly.
• slack dried hops

Verb

(ambitransitive) To slacken.
(obsolete) To mitigate; to reduce the strength of.
To lose cohesion or solidity by a chemical combination with water; to slake.
• Lime slacks.

slack is a Scrabble valid word

slack

• International English (Sowpods) - The word is valid in Scrabble ✔
• US English (TWL06) - The word is valid in Scrabble ✔
• 00 points

slack is an iScramble, QuickWords valid word

slack

• The word is valid in iScramble ✔
• The word is valid in QuickWords ✔
• 00 points

Same letters words (Anagrams)

• CALKS
• KCALS
• LACKS

Same letters plus one

• ACKLES
• BLACKS
• CAULKS
• CHALKS
• CLACKS
• CLAIKS
• CLAKES
• CLANKS
• CLOAKS
• FALCKS
• FLACKS
• LACKES
• LACKOS
• LAUCKS
• LUKACS
• LUSACK
• PLACKS
• SLACKS
• WALCKS

Same letters minus one

• ACKS
• ACLS
• ALCS
• ALKS
• ASLC
• CAKS
• CALK
• CALS
• CASK
• CLAS
• KCAL
• KCAS
• LACK
• LACS
• LASK
• LCAS
• SACK
• SALK
• SKCA
• SLAC