obligato/obliʹgahtoh/ adj and noun

• serial killer
• serial monogamy
• serial number
• seriate
• seriatim
• sericeous
• sericulture
• series
• serif
• serigraph
• serin
• serine
• seriocomic
• serious
• seriously
• serious-minded
• serjeant
• serjeant-at-arms
• serjeant-at-law
• sermon
• sermonize
• sero-
• serology
• seronegative
• seropositive