Identify the compound noun in the sentence: "She picked a sunflower."

A compound noun is formed when two or more words are combined to create a single noun with a specific meaning. In the sentence "She picked a sunflower," the term "sunflower" is a compound noun because it is made up of two words, "sun" and "flower," which together describe a specific type of flower.

"Sunflower" refers to a particular plant known for its large yellow blooms and seeds, distinguishing it from other kinds of flowers. Recognizing "sunflower" as a compound noun illustrates the concept that sometimes, two words can join to present an entirely new idea in a single noun form. The other words in the sentence do not fulfill the criteria for compound nouns: "picked" is a verb, "she" is a pronoun, and "a" is an article.