ear-shell vs abalone

ear-shell and abalone both are nouns.

Word	Noun	Adjective	Verb	Adverb
ear-shell	Yes	No	No	No
abalone	Yes	No	No	No

As nouns, ear-shell and abalone are synonyms defined as:

ear-shell and abalone: any of various large edible marine gastropods of the genus Haliotis having an ear-shaped shell with pearly interior

ear-shell (noun)	abalone (noun)
any of various large edible marine gastropods of the genus Haliotis having an ear-shaped shell with pearly interior	any of various large edible marine gastropods of the genus Haliotis having an ear-shaped shell with pearly interior