home in vs zero in

home in and zero in both are verbs.

Word	Noun	Adjective	Verb	Adverb
home in	No	No	Yes	No
zero in	No	No	Yes	No

As verbs, home in and zero in are synonyms defined as:

home in and zero in: direct onto a point or target, especially by automatic navigational aids

Other synonyms of home in include range in.

home in (verb)	zero in (verb)
direct onto a point or target, especially by automatic navigational aids	adjust (as by firing under test conditions) the zero of (a gun)
	direct onto a point or target, especially by automatic navigational aids