A compound noun contains two or more words that join together to make a single noun, like "keyboard." A compound noun is a type of compound word that is used to designate a person, place, or thing. Compound nouns can be formed in several ways, which is one reason why writing these words can be tricky. Examples: noun + noun bedroom water tank motorcycle printer cartridge noun + verb rainfall haircut train-spotting noun + adverb hanger-on passer-by verb + noun washing machine driving licence swimming pool
