toxic waste site vs wasteyard

toxic waste site and wasteyard both are nouns.

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

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

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

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

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