teardrop vs pearl

teardrop and pearl both are nouns.

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

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

teardrop: anything shaped like a falling drop (as a pendant gem on an earring)
pearl: a shape that is spherical and small

Other hypernyms of teardrop include bead, drop.

teardrop (noun)	pearl (noun)
a drop of the clear salty saline solution secreted by the lacrimal glands	a shade of white the color of bleached bones
anything shaped like a falling drop (as a pendant gem on an earring)	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

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