killas /kilˈəs/ (geology)

Clay-slate

• sophistications
• sophisticator
• sophisticators
• sophistries
• sophistry
• sophists
• Sophoclean
• sophomore
• sophomores
• sophomoric
• sophomorical
• sophs
• Sophy
• sopite
• sopited
• sopites
• sopiting
• so please you
• sopor
• soporiferous
• soporiferously
• soporiferousness
• soporific
• soporifics
• soporose