toxic waste area vs Superfund site

toxic waste area and Superfund site both are nouns.

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

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

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

Other synonyms of toxic waste area include toxic site.

toxic waste area (noun)	Superfund site (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