脅える[obieru] to become frightened
脅し付ける[odoshitsukeru] to threaten
脅し文句[odoshimonku] threatening words
脅す[odosu] to threaten
脅威[kyoui] threat

脅喝[kyoukatsu] threat
脅迫[kyouhaku] threat
脅迫罪[kyouhakuzai] criminal intimidation
脅迫者[kyouhakusha] person making threats
脅迫状[kyouhakujou] threatening letter