striking vs hopper

striking and hopper both are nouns.

Word	Noun	Adjective	Verb	Adverb
striking	Yes	Yes	No	No
hopper	Yes	No	No	No

As nouns, hopper is a hyponym of striking; that is, hopper is a word with a more specific, narrower meaning than striking:

striking (noun)	hopper (noun)
the act of contacting one thing with another	(baseball) a hit that travels along the ground
the physical coming together of two or more things	terrestrial plant-eating insect with hind legs adapted for leaping
	funnel-shaped receptacle; contents pass by gravity into a receptacle below
	a machine used for picking hops
	someone who hops

striking (adjective)	hopper (adjective)
having a quality that thrusts itself into attention
sensational in appearance or thrilling in effect