The term 'Feed on Grass' can be summarized by the crossword solution 'GRAZE, ' which is a five-letter word. Grazing is a behavior exhibited by animals, such as cows, sheep, and horses, in which they feed on grass or other vegetation. This behavior is beneficial to the animals, as it allows them to obtain the nutrients they need from the grass. Grazing also helps to maintain the health of the grass, as it prevents it from becoming overgrown.