Modifiers matching plankton:

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

Simple categories matching floating:

• construction,
• hydrocarbon,
• structure,
• figure,
• object,
• device,
• cover,
• algae,
• liquid,
• mineral,
• plant,
• node,
• chemical,
• matter,
• material,
• waste,
• institution,
• population,
• item,
• solid,
• facility,
• hydrophyte,
• vessel,
• debris,
• assets,
• craft,
• stuff,
• library,
• substance,
• particle,
• pollutant,
• contrivance,
• fabric,
• plankton,
• system,
• contaminant,
• bait,
• gas,
• animal,
• fraction,
• enclosure,
• component,
• installation,
• trash,
• vehicle,
• organism,
• body,
• layer,
• watercraft,
• article,
• container,
• substrate,
• dust,
• works,
• species,
• unit,
• windows,
• equipment,
• fruit,
• ice,
• connection,
• toy,
• particulate,
• thing,