Explanation:
Compound nouns refer to two or more nouns combined to form a single noun (sister-in-law, schoolboy, fruit juice) 6. Countable (or count) nouns have a singular and a plural form. In plural, these nouns can be used with a number- they can be counted. (friends, chairs, houses, boys...) Uncountable (or non count) nouns, however, can only be used in singular. They can't be counted. (money, bread, water, coffee...