Modifiers matching benthos:

• sessile,
• small,
• motile,
• large,
• marine,
• moving,
• mobile,

Simple categories matching sessile:

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