playpen

Plural: playpens

Noun

• A portable enclosure for a young child to safely play within.
• a portable enclosure in which babies may be left to play
• An enclosure in which babies or small children can play.
• An area or domain in which a person can exercise their activities or endeavors freely.

Examples

• The starting board in Scrabble often feels like a playpen, open for exploration.

Synonyms

pen