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

• mucus
• mucuses
• mud
• MUD
• mudbath
• mudbaths
• mud-boat
• mud-boats
• mudcat
• mudcats
• mud-clerk
• mud-clerks
• mud-cone
• mud-cones
• mud dauber
• mud daubers
• mudded
• mudder
• mudders
• muddied
• muddier
• muddies
• muddiest
• muddily
• muddiness