"ploughs" in the noun sense

1. Big Dipper, Dipper, Plough, Charles's Wain, Wain, Wagon

a group of seven bright stars in the constellation Ursa Major

2. plow, plough

a farm tool having one or more heavy blades to break the soil and cut a furrow prior to sowing

"ploughs" in the verb sense

1. plow, plough

move in a way resembling that of a plow cutting into or going through the soil

"The ship plowed through the water"

2. plow, plough, turn

to break and turn over earth especially with a plow

"Farmer Jones plowed his east field last week"

"turn the earth in the Spring"

Source: WordNet® (An amazing lexical database of English)

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