orphan site vs toxic waste area

orphan site and toxic waste area both are nouns.

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

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

orphan site: a toxic waste area where the polluter could not be identified or the polluter refused to take action or pay for the cleanup
toxic waste area: a site where toxic wastes have been dumped and the Environmental Protection Agency has designated them to be cleaned up

Other hypernyms of orphan site include Superfund site, toxic site.

orphan site (noun)	toxic waste area (noun)
a toxic waste area where the polluter could not be identified or the polluter refused to take action or pay for the cleanup	a site where toxic wastes have been dumped and the Environmental Protection Agency has designated them to be cleaned up