strike vs come across

strike is a noun but come across is not a noun.

Word	Noun	Adjective	Verb	Adverb
strike	Yes	No	Yes	No
come across	No	No	Yes	No

As verbs, strike and come across are synonyms defined as:

Other synonyms of strike include attain, chance on, chance upon, come upon, discover, fall upon, happen upon, light upon.

strike (noun)	come across (noun)
a group's refusal to work in protest against low pay or bad work conditions
a score in tenpins: knocking down all ten with the first ball
an attack that is intended to seize or inflict damage on or destroy an objective
a conspicuous success
(baseball) a pitch that the batter swings at and misses, or that the batter hits into foul territory, or that the batter does not swing at but the umpire judges to be in the area over home plate and between the batter's knees and shoulders
a gentle blow

strike (verb)	come across (verb)
cause to form (an electric arc) between electrodes of an arc lamp	be received or understood
arrive at after reckoning, deliberating, and weighing	communicate the intended meaning or impression
indicate (a certain time) by striking	come together
make a strategic, offensive, assault against an enemy, opponent, or a target	be perceived in a certain way; make a certain impression
deliver a sharp blow, as with the hand, fist, or weapon	find unexpectedly
hit against; come into sudden contact with
affect or afflict suddenly, usually adversely
produce by manipulating keys or strings of musical instruments
remove by erasing or crossing out or as if by drawing a line
pierce with force
smooth with a strickle
hook by a pull on the line
produce by ignition or a blow
form by stamping, punching, or printing
disassemble a temporary structure, such as a tent or a theatrical set
have an emotional or cognitive impact upon
drive something violently into a location
occupy or take on
cause to experience suddenly
find unexpectedly
stop work in order to press demands
attain
touch or seem as if touching visually or audibly