daikon/ʹdiek(ə)n, ʹdiekon/ noun

• speed
• speedball
• speedboat
• speedbump
• speed camera
• speed dating
• speed hump
• speed limit
• speedo
• speedometer
• speed up
• speedway
• speedwell
• speedy
• speiss
• speleology
• spell
• spellbind
• spellbound
• spellcheck
• spellchecker
• speller
• spelling
• spelling bee
• spelling checker