luster/ʹlustə/ noun and verb

• substandard
• substantial
• substantialism
• substantiate
• substantive
• substation
• substituent
• substitute
• substrate
• substratum
• substructure
• subsume
• subtenant
• subtend
• subterfuge
• subterminal
• subterranean
• subtext
• subtilize
• subtitle
• subtle
• subtlety
• subtonic
• subtopia
• subtotal