toxic waste area vs land site

toxic waste area and land site both are nouns.

Word	Noun	Adjective	Verb	Adverb
toxic waste area	Yes	No	No	No
land site	Yes	No	No	No

As nouns, land site is a hypernym of toxic waste area; that is, land site is a word with a broader meaning than toxic waste area:

toxic waste area: a site where toxic wastes have been dumped and the Environmental Protection Agency has designated them to be cleaned up
land site: the piece of land on which something is located (or is to be located)

Other hypernyms of toxic waste area include site.

toxic waste area (noun)	land site (noun)
a site where toxic wastes have been dumped and the Environmental Protection Agency has designated them to be cleaned up	the piece of land on which something is located (or is to be located)