“Mass or Uncountable Nouns” cannot be divided. In other words, in general, we cannot count a mass noun. Some “Mass Nouns” are “Flour, water, juice, rice and salt”. Other mass nouns referred to as “Abstract” nouns are countable as well as uncountable. Words like “Tennis, news, happiness” are not countable while “A quantity, A joke, An hour” are countable. Think of “Abstract nouns” as just the opposite of concrete nouns! We can smell, taste, touch, see and hear “Concrete nouns”. Remember that most grammar rules have exceptions.