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.

Comments
See the discussion in Jespersen (1924:198).

Synonyms

 * individuative and continuative

Link
Utrecht Lexicon of Linguistics