fixing agent vs hypo

fixing agent and hypo both are nouns.

Word	Noun	Adjective	Verb	Adverb
fixing agent	Yes	No	No	No
hypo	Yes	No	No	No

As nouns, hypo is a hyponym of fixing agent; that is, hypo is a word with a more specific, narrower meaning than fixing agent:

fixing agent: a chemical compound that sets or fixes something (as a dye or a photographic image)
hypo: a compound used as a fixing agent in photographic developing

Other hyponyms of fixing agent include fixative, sodium thiosulfate, sodium thiosulphate.

fixing agent (noun)	hypo (noun)
a chemical compound that sets or fixes something (as a dye or a photographic image)	a piston syringe that is fitted with a hypodermic needle for giving injections
	a compound used as a fixing agent in photographic developing