The term "nature" is ambiguous, and redundant if one means the same by it as by "reality". But it makes sense to use the term "nature" to refer to all living things on earth, on the assumptions that, first, living things are distinct and in some way more complex than dead things, and second, that it is at least possible that life of some kind evolved elsewhere in the universe, and possibly third, that such life probably is not quite of the same kind as earthly living things.