drop in vs come by

drop in and come by both are verbs.

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

As verbs, drop in and come by are synonyms defined as:

Other synonyms of drop in include drop by.

drop in (verb)	come by (verb)
visit informally and spontaneously	obtain, especially accidentally
	visit informally and spontaneously