Count noun and mass noun
A count noun is a noun that can be pluralized and combined with cardinal numerals and that generally denotes an individuatable object, while a mass noun is a noun that generally denotes an amorphous mass and that cannot be combined with numerals or pluralized.
See the discussion in Jespersen (1924:198).
Jespersen, Otto. 1924. The philosophy of grammar. London: Allen & Unwin.