The difference between Whole step and Whole tone
When used as nouns, whole step means an interval equal to two half steps, whereas whole tone means the musical interval equal (exactly or approximately) to two semitones or two-twelfths of an octave.
check bellow for the other definitions of Whole step and Whole tone
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Whole step as a noun (music):
An interval equal to two half steps; a major second.
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Whole tone as a noun (music):
The musical interval equal (exactly or approximately) to two semitones or two-twelfths of an octave