playground
noun /ˈpleɪɡraʊnd/
  /ˈpleɪɡraʊnd/
 - an outdoor area where children can play, especially at a school or in a park
- a school playground
 - an adventure playground
 - teachers on playground duty
 
Oxford Collocations Dictionaryadjective- children’s
 - adventure
 - school
 - …
 
- bully
 - bullying
 - equipment
 - …
 
- in a/the playground
 
 - a place where a particular type of people go to enjoy themselves
- The resort is a playground of the rich and famous.