magnum opus /magˈnəm ōˈpəs, magˈnŭm opˈŭs/ (Latin)

1. A great work, esp of literature or learning
2. A writer's greatest achievement or the culmination of his or her efforts

• playful
• play full
• playfully
• playfulness
• playfulnesses
• play games with
• playgirl
• playgirls
• play-goer
• play-goers
• play-going
• playground
• playgrounds
• playgroup
• playgroups
• play hard to get
• play havoc
• play havoc with
• play hell with
• play hob
• playhouse
• playhouses
• playing
• playing card
• playing cards