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A compound noun is a two words compounded into a single word,not a pronoun, which can function as the subject or object of a verb, or the object of a preposition; words which is marked nn--n in the dictionary are compounds. In grammar, it is item composed of two or more parts, written as one or two words, joined by a hyphen themselves to become a word.
eg:-novelty-toy---A novelty-toy is a small ornament placed inside an Easter Chocolate egg.
eg:-sticker-label:-This is a sticker-label to be stuck on your tooth-brush and plastic cups for identification purpose.
eg:-bus-conductor---flower shop----the adjective"self-made"------pedestrian-crossing----credit-card:-eg:-Credit card enables me to obtain goods on credit.