Compound words are made up of two separate words that together form a new word with its own meaning. Examples given include sawdust, beachball, pancake, waterfall, snowman, and butterfly. The document then provides examples of compound words to identify - downstairs mailbox and flashlight doghouse. It moves on to discuss different types of nouns, defining abstract nouns as those that cannot be detected by the five senses unlike concrete nouns which can be seen, heard, smelled, tasted, and touched. Examples of an abstract noun, bravery, and a concrete noun, puppy, are given.