stopper vs plug

stopper and plug both are nouns.

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

As nouns, stopper and plug are synonyms defined as:

stopper and plug: blockage consisting of an object designed to fill a hole tightly

Other synonyms of stopper include stopple.

As verbs, plug is a hypernym of stopper; that is, plug is a word with a broader meaning than stopper:

Other hypernyms of stopper include secure, stop up.

stopper (noun)	plug (noun)
blockage consisting of an object designed to fill a hole tightly	an old or over-worked horse
(bridge) a playing card with a value sufficiently high to insure taking a trick in a particular suit	blockage consisting of an object designed to fill a hole tightly
an act so striking or impressive that the show must be delayed until the audience quiets down	an upright hydrant for drawing water to use in fighting a fire
a remark to which there is no polite conversational reply	electrical device that fits into the cylinder head of an internal-combustion engine and ignites the gas by means of an electric spark
	an electrical device with two or three pins that is inserted in a socket to make an electrical connection
	blatant or sensational promotion
	a wad of something chewable as tobacco

stopper (verb)	plug (verb)
close or secure with or as if with a stopper	persist in working hard
	insert as a plug
	insert a plug into
	replace the center of a coin with a baser metal
	make a plug for; praise the qualities or in order to sell or promote
	deliver a quick blow to
	fill or close tightly with or as if with a plug