A parody is a work that imitates another work for comedic effect, often by exaggerating or changing the original's meaning. In the context of music, a parody would involve using the same melody but changing the lyrics to create a new and often humorous song.
Here are some other terms that are related to musical imitation:
* Counterpoint: A technique where two or more melodic lines are interwoven and played simultaneously.
* Imitation: A musical technique where one part imitates another part's melody, but at a different pitch.
* Variation: A musical technique where a theme or melody is presented in different ways, such as with different rhythms, harmonies, or instrumentation.
However, the most common and accurate term for singing the same melody with different words is a parody.