compos mentis/ˌkompəs ʹmentis/ adj

• play footsie
• play for time
• playful
• playground
• playgroup
• play hardball
• play hard to get
• play havoc with something
• play hooky
• playhouse
• playing card
• playing field
• play into the hands of somebody
• play it by ear
• play it cool
• playlet
• playlist
• playmaker
• playmate
• play (merry) hell
• play off
• play-off
• play one's cards right
• play one's trump card
• play on words