plough

(noun) a group of seven bright stars in the constellation Ursa Major. Synonyms: Big Dipper, Dipper, Plough, Charles's Wain, Wain, Wagon.

(noun) a farm tool having one or more heavy blades to break the soil and cut a furrow prior to sowing. Synonyms: plow.

(verb) move in a way resembling that of a plow cutting into or going through the soil. Synonyms: plow. Examples: "The ship plowed through the water."

(verb) to break and turn over earth especially with a plow. Synonyms: plow, turn. Examples: "Farmer jones plowed his east field last week." "Turn the earth in the spring."