An uncount noun, also known as a mass noun, is a noun that cannot be counted or enumerated. Synonyms for uncount noun include mass noun, non-count noun, uncountable noun, and uncounted noun. Common examples of uncount nouns include substances such as water, sand, and air, as well as abstract concepts like love, happiness, and anger. Mass nouns are often used with quantifiers such as "some" or "a little," and cannot be pluralized without changing their meaning. It is essential to recognize uncount nouns to use proper grammar and to construct clear and concise sentences.