Modifiers matching plankton:

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

Simple categories matching unicellular:

• plankton,
• protist,
• microbe,
• organism,
• microorganism,
• phytoplankton,
• chlorophyte,
• animal,
• parasite,
• eukaryote,
• protoctist,
• system,
• plant,
• algae,
• anaerobe,
• form,
• being,
• pathogen,
• creature,