水母 is read as すいぼ (suibo) and means jellyfish.
すいぼ
suibo
みずくらげ
aurelia (Aurelia aurita)
ひくらげ
Carybdeidae Tamoya (species of venomous box jellyfish)
すいじょうきぼかん
seaplane carrier
くらげのほね
something that one would not expect to exist
せんすいくうぼ
submarine aircraft carrier
あんどんくらげ
jimble (Carybdea rastoni)
はぶくらげ
habu jellyfish (Chironex yamaguchii)
あまくさくらげ
Amakusa jellyfish (Sanderia malayensis)
まみずくらげ
freshwater jellyfish (Craspedacusta sowerbii)
えちぜんくらげ
Nomura's jellyfish (Nemopilema nomurai)
あかくらげ
northern sea nettle (Chrysaora melanaster)
はこくらげ
box jellyfish (Cubozoa spp.)