forerunner /fˈɔːɹʌnɚ/ /fˈɔːɹʌnə/
pioneer /ˌpaɪəˈnɪr/ /ˌpaɪəˈnɪə/
pioneering /ˌpaɪəˈnɪrɪŋ/ /ˌpaɪəˈnɪərɪŋ/