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

辻褄[tsujitsuma] coherence
辻褄の合わない[tsujitsumanoawanai] incoherent
機嫌気褄[kigenkizuma] humour
褄取[tsumadori] rear toe pick
小褄取[kozumadori] rear toe pick

辻褄が合う[tsujitsumagaau] to be consistent
褄黒横這い[tsumaguroyokobai] green rice leafhopper (Nephotettix cincticeps)
辻褄を合わせる[tsujitsumawoawaseru] to make one's story to seem coherent
左褄[hidarizuma] left skirt of a kimono