慶祝[keishuku] congratulation
結婚祝[kekkoniwai] wedding present
言祝ぐ[kotohogu] to congratulate
祝い着[iwaigi] festive dress
祝う[iwau] to congratulate

祝宴[shukuen] celebratory banquet
祝賀[shukuga] celebration
祝儀[shuugi] congratulations
祝祭[shukusai] festivals