市肆[shishi] store
肆意[shii] arbitrariness
驕肆[kyoushi] being proud and self-willed

書肆[shoshi] bookstore
放肆[houshi] licentious
酒肆[shushi] liquor shop

偏芯[henshin] eccentricity (in mechanics, electronics, etc.)
燈芯[toushin] (lamp) wick
帯芯[obishin] thick obi sash
摘芯[tekishin] thinning (buds and branches)
芯地[shinji] padding

替え芯[kaeshin] spare lead
鉛筆の芯[enpitsunoshin] lead of a pencil
硬の芯[kounoshin] hard pencil lead
林檎の芯[ringonoshin] core of an apple