奸計[kankei] trick
佞奸[neikan] treacherous
奸物[kanbutsu] cunning man
奸悪[kanaku] wickedness
奸策[kansaku] shrewd (dirty) trick

奸知[kanchi] cunning
奸佞邪智[kanneijachi] wiles and cunning
奸黠[kankatsu] cunning
君側の奸[kunsokunokan] someone who curries favor with their master while secretly plotting against him

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