pentad /penˈtad/

1. A set of five things
2. A period of five years or five days
3. An atom, element or radical with a combining power of five

pentadˈic adjective

• playpens
• play possum
• playroom
• playrooms
• plays
• play safe
• playschool
• playschools
• play second fiddle
• play silly buggers
• playslip
• playslips
• playsome
• play someone false
• plays on words
• play-spell
• play-spells
• PlayStation
• playsuit
• playsuits
• play the devil
• play the field
• play the fool
• play the game
• play the giddy goat