救い[sukui] help
救い出す[sukuidasu] to rescue
救い上げる[sukuiageru] to pick up and rescue
救う[sukuu] to rescue from
救援[kyuuen] relief

救急[kyuukyuu] first-aid
救急ヘリコプター[kyuukyuuherikoputaa] ambulance helicopter
救急車[kyuukyuusha] ambulance
救急箱[kyuukyuubako] first-aid kit
救護[kyuugo] relief