There is no specific collective noun for the noun 'rubble', in
which case a noun suitable for the situation can be used; for
example, a pile of rubble, a heap of rubble, a mountain of rubble,
etc.
There is no specific collective noun for the noun 'rubble', in
which case a noun suitable for the situation can be used; for
example, a pile of rubble, a heap of rubble, a mountain of rubble,
etc.