perchloromethane vs dissolvent

perchloromethane and dissolvent both are nouns.

Word	Noun	Adjective	Verb	Adverb
perchloromethane	Yes	No	No	No
dissolvent	Yes	No	No	No

As nouns, dissolvent is a hypernym of perchloromethane; that is, dissolvent is a word with a broader meaning than perchloromethane:

perchloromethane: a colorless nonflammable liquid used as a solvent for fats and oils; because of its toxicity its use as a cleaning fluid or fire extinguisher has declined
dissolvent: a liquid substance capable of dissolving other substances

Other hypernyms of perchloromethane include dissolver, dissolving agent, resolvent, solvent, tetrachloride.

perchloromethane (noun)	dissolvent (noun)
a colorless nonflammable liquid used as a solvent for fats and oils; because of its toxicity its use as a cleaning fluid or fire extinguisher has declined	a liquid substance capable of dissolving other substances