Are jellyfish considered plankton, just very large plankton

Jellyfish are not plankton, They belong to the Phylum Coelenterata, a group of marine animals that has a central body cavity called an Enteron/Coelenteron

jelly fish are NOT plankton, something similar to a jellyfish called a portuguese man of war is a colony of small organisms and is similar to plankton, but both of these animals(a jellyfish is an animanand a man o war is many) are cnidarians

no plankton are single celled organisms and jellyfish are multi organism in a group of the animal kingdom called cnidarians

Yes.

Plankton range in size from tiny microbes (1 micrometre [0.000039 inch] or less) to jellyfish whose gelatinous bell can reach up to 2 metres in width and whose tentacles can extend over 15 metres.

No, infact jellyfish r concidered cnidarians.
Cnidarian- any invertebrate animal, as a hydra, jellyfish, sea anemone, or coral, considered as belonging to the phylum Cnidaria, characterized by the specialized stinging structures in the tentacles surrounding the mouth; a coelenterate.
A plankton is a the aggregate of passively floating, drifting, or somewhat motile organisms occurring in a body of water, primarily comprising microscopic algae & protozoa.
They r two very different organizms that r not related.
The JellyFish is related to; sponges & simple worms.

Dear Peaper King,
Jellyfish nor plankton wear make up. It would just wash off. Perhaps some use waterproof make up.

i would say no. plankton have yoru typical makeup, i.e. brain, skin, bones/exoskeleton. that sort of thing. jellyfish are invertebrates and lack a backbone which would place them in a different sub category I'd think.

Yes, jellyfish are a type of plankton called holoplankton