Synonyms of the word

mollusk

• n. (US) Alternative spelling of mollusc.

invertebrate

• n. An animal without vertebrae, i.e. backbone.
• n. (informal) A spineless person; a coward.
• adj. Lacking a backbone.

mollusc

• n. A soft-bodied invertebrate of the phylum Mollusca, typically with a hard shell of one or more pieces.
• n. (figuratively) A weak-willed person.

shellfish

• n. An aquatic invertebrate, such as a mollusc or crustacean, that has a shell, especially as food.