kai-awase (a Heian period game involving matching two pieces of a clamshell) / (slang) tribadism

an aquatic shellfish (generally limited to mollusks with calcareous shells such as clams or snails, and excluding crustaceans such as shrimp or crabs)

seashore, shore

(rare) seashore

(transitive) to enjoy something / (intransitive) to enjoy oneself

past tense and perfective aspect of 楽しむ (tanoshimu) [godan]

child

Babylonia japonica: the Japanese babylon or Japanese ivory shell

shell / shellfish

child's naive mind, child's juvenile mind