Modifiers matching cnidarian:

• pelagic,
• sessile,
• simple,
• predatory,
• marine,
• oceanic,
• colonial,
• small,

Simple categories matching sessile:

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