lightship的复数形式怎么拼写

lightship的音标：lightship的英式发音音标为：['laɪtʃɪp]lightship的美式发音音标为：['laɪtˌʃɪp]...

n.（停泊在危险水域作导航用的）灯塔船...

Here, I am not walking out to the Kish lightship, am I?喏, 我该不是正走向基什的灯台船吧?...