tephra /tefˈrə/

Ash and debris ejected by a volcano

• soothsaying
• soothsayings
• soothsays
• sootier
• sootiest
• sootily
• sootiness
• sootinesses
• sooting
• sootless
• soots
• sooty
• sooty mould
• sop
• sop.
• SOP
• soph
• sopheric
• sopherim
• Sophi
• sophism
• sophisms
• sophist
• sophister
• sophisters