diver vs pearler

diver and pearler both are nouns.

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

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

Other hyponyms of diver include deep-sea diver, pearl diver, scuba diver.

diver (noun)	pearler (noun)
large somewhat primitive fish-eating diving bird of the Northern Hemisphere having webbed feet placed far back; related to the grebes	a diver who searches for molluscs containing pearls
someone who dives (into water)
someone who works underwater