groundwater /ɡɹˈaʊndwɔːɾɚ/ /ɡɹˈaʊndwɔːtə/
underground water /ˌʌndɚɡɹˈaʊnd wˈɔːɾɚ/ /ˌʌndəɡɹˈaʊnd wˈɔːtə/