Translation guide
A child's friend to play with. Japanese uses different words depending on the relationship and context, and often the concept is expressed descriptively rather than with a single noun.
A friend a child regularly plays with, often in the neighborhood or at school.
A child met at a park or event for a short play session, not necessarily a regular friend.
Descriptive: 'a child to play with on the spot'. Used when the relationship is temporary.
公園でその場で一緒に遊ぶ子を見つけた。
He found a playmate at the park.
For children, the distinction between 'friend' and 'playmate' is less rigid in Japanese. 友達 (ともだち) covers both unless you need to emphasize the play aspect.
Using 'playmate' for adults in English can have sexual connotations. In Japanese, 遊び友達 or 遊び仲間 for adults might imply a casual dating partner or friend with benefits. For adult friendships, use 友達 or 遊びに行く友達 (friend to hang out with).
The most direct and common translation. Literally 'play friend'. Used for children.
うちの子は近所に遊び友達がたくさんいる。
My child has many playmates in the neighborhood.
Similar to 遊び友達, but 仲間 implies a group or companion. Slightly more casual.
公園で遊び仲間と鬼ごっこをした。
I played tag with my playmates at the park.
Descriptive phrase meaning 'a friend to play with'. Natural when the noun 'playmate' feels too specific.
一緒に遊ぶ友達が欲しい。
I want a playmate.
Simply 'friend'. Often sufficient in context, as Japanese doesn't always distinguish 'playmate' from 'friend' for children.
今日は友達と遊ぶ約束をした。
I made plans to play with my playmate today.
Instead of a noun, describe the action: 'play together with someone'. Very natural.
誰か一緒に遊ばない？
Won't someone be my playmate?