fastness 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 quality or state of being fast (in various senses).
(countable) Something that is fast, or that causes someone or something to be fast (in various senses).

fastness is a Scrabble valid word

f4a1s1t1n1e1s1s1

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

fastness is an iScramble, QuickWords valid word

f1a2s3t4n5e6s7s8

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

Same letters words (Anagrams)

• none

Same letters plus one

• FATNESSES

Same letters minus one

• ASSENTS
• FASTENS
• FATNESS
• SNASTES