Pitch is a sound consists of a fundamental frequency which can be recognised as high or low tone register within the human absolute threshold of hearing range (20 Hz to 20 kHz). A pitch can be represented by the value of the fundamental frequency in Hertz (Hz) or the pitch note name (with or without octave number) Example: 440 Hz = A4 (A at 4th octave).
Tone is the color or timbre and basic octave registration of sound. Example: Bright violin tone and higher voice tone register.
Tone also is the type of interval between high pitch and low pitch. Example: semitone and wholetone.
Note is a musical notation symbol which represent with or without the pitch information and the sustained sound length-value. Example: an A (pitch) minim (length-value name) note.