superfast is a valid English word

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

Meanings

Adjective (NOT COMPARABLE)

Extremely fast.

Adverb (NOT COMPARABLE)

At extremely high speed.

superfast is a Scrabble valid word

s1u1p3e1r1f4a1s1t1

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

superfast is not an iScramble, QuickWords valid word

s1u2p3e4r5f6a7s8t9

• The word is not valid in iScramble ✘
• The word is not valid in QuickWords ✘
• 45 points

Same letters words (Anagrams)

• SUPERFATS

Same letters plus one

• PERFUSANTS
• PERFUSATES
• SUPERFACTS

Same letters minus one

• FAUTRESS
• FRATUSES
• PASTURES
• RAPTUSES
• SUPERFAT
• UPSTARES