area vs land area

area and land area both are nouns.

Word	Noun	Adjective	Verb	Adverb
area	Yes	No	No	No
land area	Yes	No	No	No

As nouns, land area is a hyponym of area; that is, land area is a word with a more specific, narrower meaning than area:

area: the extent of a 2-dimensional surface enclosed within a boundary
land area: an area of ground used for some particular purpose (such as building or farming)

Other hyponyms of area include acreage, footprint, erasure, blank space, place, space, space, balk, baulk, plane section, section.

area (noun)	land area (noun)
a part of a structure having some specific characteristic or function	an area of ground used for some particular purpose (such as building or farming)
the extent of a 2-dimensional surface enclosed within a boundary
a part of an animal that has a special function or is supplied by a given artery or nerve
a subject of study
a particular geographical region of indefinite boundary (usually serving some special purpose or distinguished by its people or culture or geography)
a particular environment or walk of life