sea-ear vs ear-shell

sea-ear and ear-shell both are nouns.

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

As nouns, ear-shell is a hypernym of sea-ear; that is, ear-shell is a word with a broader meaning than sea-ear:

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

Other hypernyms of sea-ear include abalone.

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