area vs blank space

area and blank space both are nouns.

Word	Noun	Adjective	Verb	Adverb
area	Yes	No	No	No
blank space	Yes	No	No	No

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

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

area (noun)	blank space (noun)
a part of a structure having some specific characteristic or function	a blank area
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