drop one's serve vs lose

drop one's serve and lose both are verbs.

Word	Noun	Adjective	Verb	Adverb
drop one's serve	No	No	Yes	No
lose	No	No	Yes	No

As verbs, lose is a hypernym of drop one's serve; that is, lose is a word with a broader meaning than drop one's serve:

drop one's serve (verb)	lose (verb)
lose a game in which one is serving	be set at a disadvantage
	withdraw, as from reality
	fail to win
	suffer the loss of a person through death or removal
	allow to go out of sight or mind
	fail to perceive or to catch with the senses or the mind
	fail to get or obtain
	miss from one's possessions; lose sight of
	fail to keep or to maintain; cease to have, either physically or in an abstract sense
	fail to make money in a business; make a loss or fail to profit