What's the difference between kettledrum and kettledrummer?

Kettledrum

Definition:

• (n.) A drum made of thin copper in the form of a hemispherical kettle, with parchment stretched over the mouth of it.
• (n.) An informal social party at which a light collation is offered, held in the afternoon or early evening. Cf. Drum, n., 4 and 5.

Example Sentences:

• (1) Like being inside a kettledrum with a whole symphony going on out there and with thunder in wraparound quadraphonic!"

Kettledrummer

Definition:

• (n.) One who plays on a kettledrum.

Example Sentences: