Scrabble?! WARBLE

Definitions of WARBLE in various dictionaries:

noun - a lumpy abscess under the hide of domestic mammals caused by larvae of a botfly or warble fly

verb - sing or play with trills, alternating with the half note above or below

verb - sing by changing register

To sing with trills, runs, or quavers.

The act or an instance of singing with trills, runs, or quavers.

An abscessed boillike swelling on the back of cattle, deer, and certain other animals, caused by the larva of a warble fly.

The warble fly, especially in its larval stage.

A hard lump of tissue on a riding horse’s back caused by rubbing of the saddle.

verb - to sing with melodic embellishments