Superfund site vs toxic waste area

Superfund site and toxic waste area both are nouns.

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

As nouns, Superfund site and toxic waste area are synonyms defined as:

Superfund site and toxic waste area: a site where toxic wastes have been dumped and the Environmental Protection Agency has designated them to be cleaned up

Other synonyms of Superfund site include toxic site.

Superfund site (noun)	toxic waste area (noun)
a site where toxic wastes have been dumped and the Environmental Protection Agency has designated them to be cleaned up	a site where toxic wastes have been dumped and the Environmental Protection Agency has designated them to be cleaned up