superspeed is a valid English word

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

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Meanings

Noun (COUNTABLE AND UNCOUNTABLE)

Singular Plural
superspeed superspeeds
    Remarkably fast speed.

Adjective (NOT COMPARABLE)

Not comparable
    Operated at or capable of moving at exceedingly high speeds.

superspeed is a Scrabble valid word


superspeed is not an iScramble valid word


superspeed is not an QuickWords valid word


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Same letters words (Anagrams)


Same letters plus one


Same letters minus one