toxic waste site vs toxic waste dump

toxic waste site and toxic waste dump both are nouns.

Word	Noun	Adjective	Verb	Adverb
toxic waste site	Yes	No	No	No
toxic waste dump	Yes	No	No	No

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

toxic waste site and toxic waste dump: a location where toxic wastes can be or have been disposed of (often illegally)

Other synonyms of toxic waste site include toxic dumpsite.

toxic waste site (noun)	toxic waste dump (noun)
a location where toxic wastes can be or have been disposed of (often illegally)	a location where toxic wastes can be or have been disposed of (often illegally)