extractant vs dissolving agent

extractant and dissolving agent both are nouns.

Word	Noun	Adjective	Verb	Adverb
extractant	Yes	No	No	No
dissolving agent	Yes	No	No	No

As nouns, dissolving agent is a hypernym of extractant; that is, dissolving agent is a word with a broader meaning than extractant:

extractant: an immiscible liquid used to extract a substance from another liquid.
dissolving agent: a liquid substance capable of dissolving other substances

Other hypernyms of extractant include dissolvent, dissolver, resolvent, solvent.

extractant (noun)	dissolving agent (noun)
an immiscible liquid used to extract a substance from another liquid.	a liquid substance capable of dissolving other substances