乳幼児[nyuuyouji] infants
幼い[osanai] very young
幼馴染[osananajimi] childhood friend
幼魚[yougyo] fry (young fish)
幼形進化[youkeishinka] paedomorphosis

幼子[osanago] infant
幼児[youji] infant
幼児ポルノ[youjiporuno] child pornography
幼児語[youjigo] baby talk (like choo-choo for train, etc.)
幼時[youji] childhood

向きに成る[mukininaru] to become serious
持て成し[motenashi] entertainment
成吉思汗[jingisukan] Japanese mutton and vegetable dish
亜成層圏[aseisouken] substratosphere
成す[nasu] to build up

成手[narite] candidate
育成栽培[ikuseisaibai] vegetable and fruit growing
一気呵成[ikkikasei] finishing writing, work, etc. at a stroke (stretch)
化成[kasei] change
化成工業[kaseikougyou] chemical industry

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