seed pearl vs pearl

seed pearl and pearl both are nouns.

Word	Noun	Adjective	Verb	Adverb
seed pearl	Yes	No	No	No
pearl	Yes	No	Yes	No

As nouns, pearl is a hypernym of seed pearl; that is, pearl is a word with a broader meaning than seed pearl:

seed pearl: a small imperfect pearl
pearl: a smooth lustrous round structure inside the shell of a clam or oyster; much valued as a jewel

seed pearl (noun)	pearl (noun)
a small imperfect pearl	a shade of white the color of bleached bones
	a smooth lustrous round structure inside the shell of a clam or oyster; much valued as a jewel
	a shape that is spherical and small

seed pearl (verb)	pearl (verb)
	gather pearls, from oysters in the ocean