toxic dumpsite vs rubbish dump

toxic dumpsite and rubbish dump both are nouns.

Word	Noun	Adjective	Verb	Adverb
toxic dumpsite	Yes	No	No	No
rubbish dump	Yes	No	No	No

As nouns, rubbish dump is a hypernym of toxic dumpsite; that is, rubbish dump is a word with a broader meaning than toxic dumpsite:

toxic dumpsite: a location where toxic wastes can be or have been disposed of (often illegally)
rubbish dump: a piece of land where waste materials are dumped

Other hypernyms of toxic dumpsite include dump, dumpsite, garbage dump, trash dump, waste-yard, wasteyard.

toxic dumpsite (noun)	rubbish dump (noun)
a location where toxic wastes can be or have been disposed of (often illegally)	a piece of land where waste materials are dumped