* Common nouns refer to general things, not specific ones. Examples include "tree," "farm," "color," etc.
* Proper nouns are specific names of people, places, or things. They are capitalized.
"Yellow tree farm" is a combination of words that describes a specific type of farm. It functions as a collective noun, meaning it refers to a group of trees. However, it lacks the specificity to be considered a proper noun.
Therefore, "yellow tree farm" is not a common noun but rather a descriptive phrase.