superfast is a valid English word

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

Meanings

Adjective (NOT COMPARABLE)

Not comparable
    Extremely fast.

Adverb (NOT COMPARABLE)

Not comparable
    At extremely high speed.

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superfast is a Scrabble valid word

superfast


superfast is not an iScramble, QuickWords valid word

superfast


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Same letters words (Anagrams)


Same letters plus one


Same letters minus one