hit vs run into

hit is a noun but run into is not a noun.

Word	Noun	Adjective	Verb	Adverb
hit	Yes	No	Yes	No
run into	No	No	Yes	No

As verbs, hit and run into are synonyms defined as:

Other synonyms of hit include collide with, impinge on, strike.

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

hit (noun)	run into (noun)
the act of contacting one thing with another
a conspicuous success
(baseball) when a batter strikes a picthed ball into fair territory and arrives safely on base (without an error or a fielder's choice being made by the defense)
a murder carried out by an underworld syndicate
a connection made via the internet to another website
a dose of a narcotic drug
(physics) a brief event in which two or more bodies come together

hit (verb)	run into (verb)
pay unsolicited and usually unwanted sexual attention to	collide violently with an obstacle
make a strategic, offensive, assault against an enemy, opponent, or a target	hit against; come into sudden contact with
hit with a missile from a weapon	come together
hit the intended target or goal	be beset by
deal a blow to, either with the hand or with an instrument
hit against; come into sudden contact with
produce by manipulating keys or strings of musical instruments
cause to move by striking
affect or afflict suddenly, usually adversely
reach a destination, either real or abstract
drive something violently into a location
reach a point in time, or a certain state or level
cause to experience suddenly
encounter by chance
kill intentionally and with premeditation