Tower Guard, Often Called a Beefeater
Puzzle 20 of Animals with Weird Names Hard Pack
Question is: Tower Guard, Often Called a Beefeater
and the answer is: YEOMAN
Word Meaning:
YEOMAN — (UK) An official providing honorable service in a royal or high noble household, ranking between a squire and a page. Especially, a yeoman of the guard, a member of a ceremonial bodyguard to the UK monarch (not to be confused with a Yeoman Warder).
Definitions from Wiktionary.