katabothron /kat-ə-bothˈron/ or katavothron /ka-tavˈo-thron/

An underground water channel

• nitrous
• nitrous acid
• nitrous anhydride
• nitrous bacteria
• nitrous oxide
• nitrox
• nitroxyl
• nitroxyls
• nitry
• nitryl
• nitryls
• nits
• nittier
• nittiest
• nitty
• nitty-gritty
• nitwit
• nitwits
• nitwitted
• nitwittedness
• nitwittednesses
• nitwitteries
• nitwittery
• nival
• nivation