炬燵[kotatsu] kotatsu
炬火[kyoka] pine torch
掘炬燵[horigotatsu] low, covered table placed over a hole in the floor of a Japanese-style room

置炬燵[okigotatsu] portable brazier
炬燵虫[kotatsumushi] someone who curls up under a kotatsu all winter

火燵掛布[kotatsugake] cover for kotatsu
火燵布団[kotatsubuton] cover for kotatsu
火燵[kotatsu] kotatsu

掘炬燵[horigotatsu] low, covered table placed over a hole in the floor of a Japanese-style room
置火燵[okigotatsu] portable brazier
炬燵虫[kotatsumushi] someone who curls up under a kotatsu all winter

ランブル鞭毛虫[ranburubenmouchuu] giardia (flagellate protozoan)
ランブル鞭毛虫症[ranburubenmouchuushou] giardiasis
いも虫[imomushi] hornworm (caterpillar of a hawk moth)
益虫[ekichuu] useful insect
円虫類[enchuurui] round worms

夏虫[natsumushi] summer insect
蛔虫[kaichuu] roundworm (Ascaris lumbricoides)
害虫[gaichuu] harmful insect
鈎虫[kouchuu] hookworm
寄生虫[kiseichuu] parasite