vacant lot vs lot

vacant lot and lot both are nouns.

Word	Noun	Adjective	Verb	Adverb
vacant lot	Yes	No	No	No
lot	Yes	No	Yes	No

As nouns, lot is a hypernym of vacant lot; that is, lot is a word with a broader meaning than vacant lot:

vacant lot (noun)	lot (noun)
a lot on which there are no permanent buildings	anything (straws or pebbles etc.) taken or chosen at random
	an unofficial association of people or groups
	any collection in its entirety
	a parcel of land having fixed boundaries
	(often followed by `of') a large number or amount or extent
	your overall circumstances or condition in life (including everything that happens to you)

vacant lot (verb)	lot (verb)
	administer or bestow, as in small portions
	divide into lots, as of land, for example