injectant vs injection

injectant and injection both are nouns.

Word	Noun	Adjective	Verb	Adverb
injectant	Yes	No	No	No
injection	Yes	No	No	No

As nouns, injectant and injection are synonyms defined as:

injectant and injection: any solution that is injected (as into the skin)

injectant (noun)	injection (noun)
any solution that is injected (as into the skin)	the forceful insertion of a substance under pressure
	the act of putting a liquid into the body by means of a syringe
	any solution that is injected (as into the skin)