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

オムツ気触れ[omutsukabure] diaper rash
お気の毒[okinodoku] pitiful
御天気[otenki] weather
利かん気[kikanki] daring
さり気ない[sarigenai] nonchalant

哀れ気[awarege] sad
悪気[warugi] ill will
圧搾空気[assakukuuki] compressed air
圧縮空気[asshukukuuki] compressed air
圧電気[atsudenki] piezoelectricity