blockage vs stopper

blockage and stopper both are nouns.

Word	Noun	Adjective	Verb	Adverb
blockage	Yes	No	No	No
stopper	Yes	No	Yes	No

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

Other hyponyms of blockage include breech closer, breechblock, plug, stopple, vapor lock, vapour lock.

blockage (noun)	stopper (noun)
the act of blocking	blockage consisting of an object designed to fill a hole tightly
an obstruction in a pipe or tube	(bridge) a playing card with a value sufficiently high to insure taking a trick in a particular suit
the physical condition of blocking or filling a passage with an obstruction	an act so striking or impressive that the show must be delayed until the audience quiets down
	a remark to which there is no polite conversational reply

blockage (verb)	stopper (verb)
	close or secure with or as if with a stopper