frogman vs pearler

frogman and pearler both are nouns.

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

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

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

frogman (noun)	pearler (noun)
someone who works underwater	a diver who searches for molluscs containing pearls