Modifiers matching plankton:

• animal,
• oceanic,
• larger,
• large,
• unicellular,
• marine,
• pelagic,
• crustacean,
• net,
• motile,
• abundant,
• microscopic,
• floating,
• bioluminescent,
• small,
• gelatinous,

Simple categories matching motile:

• organism,
• invertebrate,
• activity,
• eukaryote,
• creature,
• event,
• prey,
• animal,
• process,
• benthos,
• predator,
• system,
• behavior,
• algae,
• crustacean,
• fauna,
• group,
• cell,
• phenomenon,
• plankton,
• metazoan,
• nekton,