diatomaceous earth vs diatomite

diatomaceous earth and diatomite both are nouns.

Word	Noun	Adjective	Verb	Adverb
diatomaceous earth	Yes	No	No	No
diatomite	Yes	No	No	No

As nouns, diatomaceous earth and diatomite are synonyms defined as:

diatomaceous earth and diatomite: a light soil consisting of siliceous diatom remains and often used as a filtering material

Other synonyms of diatomaceous earth include kieselguhr.

diatomaceous earth (noun)	diatomite (noun)
a light soil consisting of siliceous diatom remains and often used as a filtering material	a light soil consisting of siliceous diatom remains and often used as a filtering material