drop by vs call in

drop by and call in both are verbs.

Word	Noun	Adjective	Verb	Adverb
drop by	No	No	Yes	No
call in	No	No	Yes	No

As verbs, call in is a hypernym of drop by; that is, call in is a word with a broader meaning than drop by:

Other hypernyms of drop by include call, visit.

drop by (verb)	call in (verb)
visit informally and spontaneously	make a phone call
	summon to a particular activity or employment
	summon to enter
	cause to be returned
	demand payment of (a loan)
	pay a brief visit
	take a player out of a game in order to exchange for another player