Modifiers matching benthos:

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

Simple categories matching sessile:

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