swimmer vs plunger

swimmer and plunger both are nouns.

Word	Noun	Adjective	Verb	Adverb
swimmer	Yes	No	No	No
plunger	Yes	No	No	No

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

Other hyponyms of swimmer include backstroker, breaststroker, diver, skinny-dipper.

swimmer (noun)	plunger (noun)
a trained athlete who participates in swimming meets	mechanical device that has a plunging or thrusting motion
a person who travels through the water by swimming	hand tool consisting of a stick with a rubber suction cup at one end; used to clean clogged drains
	someone who risks losses for the possibility of considerable gains
	someone who dives (into water)