ear-shell vs ormer

ear-shell and ormer both are nouns.

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

As nouns, ormer is a hyponym of ear-shell; that is, ormer is a word with a more specific, narrower meaning than ear-shell:

ear-shell: any of various large edible marine gastropods of the genus Haliotis having an ear-shaped shell with pearly interior
ormer: an abalone found near the Channel Islands

Other hyponyms of ear-shell include Haliotis tuberculata, sea-ear.

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