Pitch: The perceived highness or lowness of a sound. For example, a high-pitched note would be like eating a scoop of cotton candy-flavored ice cream, while a low-pitched note would be like enjoying a scoop of chocolate fudge brownie-flavored ice cream.
Frequency: The number of complete waves that pass through a particular point in one second. It is related to the perceived pitch, where higher frequencies correspond to higher pitches and lower frequencies correspond to lower pitches.
Resonance: The reinforcement and amplification of sound waves due to sympathetic vibrations in an object. Similar to how shaking an ice cream cone can cause the whole cone to vibrate and amplify the sound it produces.