Is world an abstract noun

The noun 'world' is an abstract noun as a Word for the concerns of the earth and human affairs; a class of persons sharing a common interest or activity; the scene of one's life and action (your own world); a Word for a concept.

The noun 'world' is a concrete noun as a Word for the planet Earth, together with all of its places and peoples; a particular region or group of countries; another planet like the Earth; a Word for a physical thing or a physical place.