Semitone

Chromatic Scale: The chromatic scale includes all twelve pitches within an octave and consists entirely of consecutive semitones.

Whole Tone Scale: Unlike the semitone, which represents a half step, the whole tone scale consists only of whole steps or tones between each note.

Enharmonic Equivalent: Enharmonic equivalents are two different notations (such as C# and Db) that represent the same pitch on an instrument but are written differently.