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

誤魔化し[gomakashi] hanky-panky
間誤付かせる[magotsukaseru] to fluster
間誤付く[magotsuku] to be confused
誤ち[ayamachi] fault
誤つ[ayamatsu] to err

過誤[kago] mistake
確率誤差[kakuritsugosa] random error
見誤る[miayamaru] to mistake someone for someone else
個人誤差[kojingosa] personal equation
誤り[ayamari] error

に過ぎない[nisuginai] no more than
マルコフ過程[marukofukatei] Markov process
為過ぎる[shisugiru] to overdo
一過[ikka] passing away
一過性[ikkasei] transient (pain or fever)

過ぎ[sugi] past
過ぎる[sugiru] to pass through
過ぎ去った可能性[sugisattakanousei] might-have-been
過去る[sugisaru] to pass
過す[sugosu] to pass (time)