pentalogy /pen-talˈə-ji/

1. A pentad, esp of published works
2. A series of five related books

• gas gun
• gas guns
• gas-guzzler
• gas-guzzlers
• gas-guzzling
• gash
• gas heater
• gas heaters
• gashed
• gas helmet
• gas helmets
• gasher
• gashes
• gashest
• gashful
• gashing
• gashliness
• gashlinesses
• gashly
• gasholder
• gasholders
• gasification
• gasifications
• gasified
• gasifier