toxic waste dump vs toxic waste site

toxic waste dump and toxic waste site both are nouns.

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

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

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

Other synonyms of toxic waste dump include toxic dumpsite.

toxic waste dump (noun)	toxic waste site (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)