Invertebrates

noun a free-swimming marine coelenterate with a jellylike bell- or saucer-shaped body that is typically transparent and has stinging tentacles around the edge

• The jellyfish is a fascinating marine creature with a gelatinous body and tentacles.
• I saw a jellyfish while snorkeling at the beach today.
• Dude, did you see that huge jellyfish in the water? It was gnarly!
• Her thoughts drifted like jellyfish, floating aimlessly in her mind.

noun giant huntsman spider - a type of spider known for its large size and hunting abilities

• The giant huntsman spider is known for its impressive size and speed.
• Have you ever seen a giant huntsman spider in real life? It's huge!
• That giant huntsman spider is freakin' massive!
• The giant huntsman spider seemed to loom over the entire room, casting a shadow of fear.

noun a member of the class Actinozoa, which includes sea anemones and corals

• The actinizoan is a type of marine invertebrate known for its radial symmetry.
• I saw a cool actinizoan at the aquarium today, it looked like a starfish!
• That actinizoan is pretty rad, dude.
• Her personality is like an actinizoan, with different facets radiating outwards.