sink plug vs tub stopper

sink plug and tub stopper both are nouns.

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

As nouns, sink plug and tub stopper are synonyms defined as:

sink plug and tub stopper: A plug intended for washbasins, bath tubs and other similar water containers.

Other synonyms of sink plug include basin plug, bath plug.

sink plug (noun)	tub stopper (noun)
A plug intended for washbasins, bath tubs and other similar water containers.	A plug intended for washbasins, bath tubs and other similar water containers.