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

藺草[igusa] soft rush (Juncus effusus var. decipiens)
藺草科[igusaka] Juncaceae (the rush family)
蛍藺[hotarui] Scirpus hotarui (species of bulrush)

太藺[futoi] softstem bulrush (Scirpus tabernaemontani)
アンペラ藺[anperai] Machaerina rubiginosa (species of tropical sedge)
綾藺笠[ayaigasa] type of traditional Japanese conical hat