feed vs inject

feed is a noun but inject is not a noun.

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

As verbs, inject is a hyponym of feed; that is, inject is a word with a more specific, narrower meaning than feed:

feed (noun)	inject (noun)
food for domestic livestock

feed (verb)	inject (verb)
provide with fertilizers or add nutrients to	give an injection to
introduce continuously	to introduce (a new aspect or element)
take in food; used of animals only	to insert between other elements
give food to	feed intravenously
serve as food for; be the food for	take by injection
feed into; supply	force or drive (a fluid or gas) into by piercing
provide as food
gratify
profit from in an exploitatory manner
move along, of liquids
support or promote