lot vs building site

lot and building site both are nouns.

Word	Noun	Adjective	Verb	Adverb
lot	Yes	No	Yes	No
building site	Yes	No	No	No

As nouns, building site is a hyponym of lot; that is, building site is a word with a more specific, narrower meaning than lot:

Other hyponyms of lot include car park, park, parking area, parking lot, vacant lot.

lot (noun)	building site (noun)
anything (straws or pebbles etc.) taken or chosen at random	a lot on which there are no permanent buildings
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)

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