public transport vs transit

public transport and transit both are nouns.

Word	Noun	Adjective	Verb	Adverb
public transport	Yes	No	No	No
transit	Yes	No	Yes	No

public transport (noun)	transit (noun)
conveyance for passengers or mail or freight	a journey usually by ship
	a surveying instrument for measuring horizontal and vertical angles, consisting of a small telescope mounted on a tripod
	a facility consisting of the means and equipment necessary for the movement of passengers or goods

public transport (verb)	transit (verb)
	make a passage or journey from one place to another
	cause or enable to pass through
	revolve (the telescope of a surveying transit) about its horizontal transverse axis in order to reverse its direction
	pass across (a sign or house of the zodiac) or pass across (the disk of a celestial body or the meridian of a place)