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

• five
• five-a-day
• five-and-dime
• Five Articles
• five-a-side
• five-bar
• five-day week
• five-day weeks
• five-eighth
• five-eighths
• five-finger
• fivefinger
• fivefingers
• fivefold
• five Ks
• five-line whip
• Five Nations
• five-o'clock shadow
• five-parted
• fivepence
• fivepences
• fivepenny
• fivepenny morris
• fivepin
• fivepins