1. Any undertaking that is easy to do
   - cinch, breeze, picnic, snap, duck soup [N. Amer], pushover, walkover, piece of cake, doss [Brit] 
2. Activity by children that is guided more by imagination than by fixed rules
   - play

Derived forms: child's plays

Type of: diversion, labor [US], labour [Brit, Cdn], project, recreation, task, undertaking

• collimation
• collimator
• collinear
• collins
• Collinsia
• Collinsia bicolor
• Collinsia heterophylla
• Collinsia parviflora
• Collinsia verna
• Collinsonia
• Collinsonia canadensis
• Collis Potter Huntington
• collision
• collision course
• Collocalia
• Collocalia inexpectata
• collocate
• collocate with
• collocation
• collodion
• collogue
• colloid
• colloidal
• colloidal gel
• colloidal solution