The difference between Seafood and Shellfish
When used as nouns, seafood means fish, shellfish, seaweed, and other edible aquatic life, whereas shellfish means an aquatic invertebrate having a shell, such as a mollusc or crustacean, especially when edible.
check bellow for the other definitions of Seafood and Shellfish
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Seafood as a noun (uncountable, countable):
Fish, shellfish, seaweed, and other edible aquatic life.
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Shellfish as a noun:
An aquatic invertebrate having a shell, such as a mollusc or crustacean, especially when edible.