Modifiers matching polyp:

• benign,
• sessile,
• small,

Simple categories matching sessile:

• resource,
• invertebrate,
• echinoderm,
• organism,
• mollusc,
• polyp,
• bivalve,
• animal,
• form,
• prey,
• predator,
• taxon,
• fauna,
• ciliate,
• creature,
• cnidarian,
• protozoan,
• coelenterate,
• benthos,
• shellfish,