[tlhIngan Hol] placing {-lu'} on {'oH} and {ghaH}

We know we can say things like, {vIghro' 'oHba'}, {Duj 'oHlaw'}, {nov ghaHchugh, vaj..} I was wondering, if we could say {romuluSngan ghaHlu'} for "someone (unspecified) is a romulan". There's something, which feels strange seeing/reading the {ghaHlu'}, but I can't find what it actually is. ~ hffjfjjj