恐らく[osoraku] perhaps
恐れ[osore] fear
恐れ戦く[osoreononoku] to tremble with fear
恐れ入る[osoreiru] to be sorry
恐ろしい[osoroshii] terrible

恐喝[kyoukatsu] blackmail
恐慌[kyoukou] panic
恐妻家[kyousaika] hen-pecked husband
恐妻病[kyousaibyou] wife-phobia
恐縮[kyoushuku] feeling obliged

掻攫う[kassarau] to nab
藻掻く[mogaku] to struggle
悪足掻き[waruagaki] useless resistance
引掻く[hikkaku] to scratch
隔靴掻痒[kakkasouyou] being frustrated because something is not quite as hoped (just as one cannot scratch an itch from outside a shoe)

汗を掻く[asewokaku] to perspire
犬掻き[inukaki] dog paddle (swimming style)
掻き回す[kakimawasu] to stir up
掻き合わせる[kakiawaseru] to adjust
掻き込む[kakikomu] to carry under the arm