reverse osmosis vs chemical science

reverse osmosis and chemical science both are nouns.

Word	Noun	Adjective	Verb	Adverb
reverse osmosis	Yes	No	No	No
chemical science	Yes	No	No	No

reverse osmosis (noun)	chemical science (noun)
(chemistry) a method of producing pure water; a solvent passes through a semipermeable membrane in a direction opposite to that for natural osmosis when it is subjected to a hydrostatic pressure greater than the osmotic pressure	the science of matter; the branch of the natural sciences dealing with the composition of substances and their properties and reactions