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

頻りに[shikirini] frequently
一頻り[hitoshikiri] for a while
高頻度[kouhindo] high frequency
吹き頻る[fukishikiru] to blow violently
低頻度[teihindo] low frequency

頻死[hinshi] dying
頻出[hinshutsu] common
頻度[hindo] frequency
頻発[hinpatsu] frequency
頻繁[hinpan] frequent