organism vs nekton

Other hyponyms of organism include benthos, dwarf, heterotroph, parent, individual, mortal, person, somebody, someone, soul, animal, animate being, beast, brute, creature, fauna, flora, plant, plant life, native, recombinant, conspecific, carrier, denizen, amphidiploid, diploid, haploid, heteroploid, polyploid, animalcule, animalculum, micro-organism, microorganism, aerobe, anaerobe, cross, crossbreed, hybrid, polymorph, congenator, congener, congeneric, relative, plankton, parasite, host, commensal, myrmecophile, eucaryote, eukaryote, procaryote, prokaryote, zooid, clon, clone, atavist, throwback, individual, mascot, mutant, mutation, sport, variation, postdiluvian, sitter, stander, utterer, vocaliser, vocalizer, endemic, fungus, nonvascular organism, relict, saprophyte, saprophytic organism, saprobe, katharobe, epilith.