plunger vs diver

plunger and diver both are nouns.

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

As nouns, plunger and diver are synonyms defined as:

plunger (noun)	diver (noun)
mechanical device that has a plunging or thrusting motion	large somewhat primitive fish-eating diving bird of the Northern Hemisphere having webbed feet placed far back; related to the grebes
hand tool consisting of a stick with a rubber suction cup at one end; used to clean clogged drains	someone who dives (into water)
someone who risks losses for the possibility of considerable gains	someone who works underwater
someone who dives (into water)