Borough, Burro & Burrow

Borough refers to a village or a political division of a city or an incorporated town or municipality, that is smaller than a city which may be perceived as part of a larger metropolitan area: “In the metropolis of Mumbai, Bandra is a borough where many people live.”
Burro is a small donkey often used as a pack animal: “Burro’s are used to carry equipment over the mountains.”
Last but not the least, burrow refers to a small hole made in the ground as by a rabbit for habitation and refuge. It also refers to make a tunnel by digging either by hand or with machinery: “The engineers used a large bore to burrow through the hillside while building the railroad.”