toxic site vs Superfund site

toxic site and Superfund site both are nouns.

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

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

toxic site 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 site include toxic waste area.

toxic site (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