The term FARM PEN is a combination of two words. The first word, FARM, is a noun that refers to an area of land used for the purpose of cultivating crops and raising animals. The second word, PEN, is a noun that refers to an enclosed area used to contain animals, such as a PIGSTY or a STY. The crossword solutions for this term are STY (3 letters) and PIGSTY (6 letters). A STY is a small enclosure for pigs, while a PIGSTY is a larger enclosure for pigs.