insert vs plug into

insert is a noun but plug into is not a noun.

Word	Noun	Adjective	Verb	Adverb
insert	Yes	No	Yes	No
plug into	No	No	Yes	No

As verbs, plug into is a hyponym of insert; that is, plug into is a word with a more specific, narrower meaning than insert:

insert (noun)	plug into (noun)
(film) a still picture that is introduced and that interrupts the action of a film
(broadcasting) a local announcement inserted into a network program
an artifact that is inserted or is to be inserted
a folded section placed between the leaves of another publication

insert (verb)	plug into (verb)
place, fit, or thrust (something) into another thing	plug into an outlet
insert casually
put or introduce into something
fit snugly into