inject vs injectable

inject is not an adjective while injectable is an adjective.

Word	Noun	Adjective	Verb	Adverb
inject	No	No	Yes	No
injectable	No	Yes	No	No

inject (adjective)	injectable (adjective)
	(used of drugs) capable of being injected

inject (verb)	injectable (verb)
give an injection to
to introduce (a new aspect or element)
to insert between other elements
feed intravenously
take by injection
force or drive (a fluid or gas) into by piercing