Question: what constellations have 7 stars?
Answer: The Big Dipper (US, Canada) or the Plough (UK, Ireland) is a large asterism consisting of seven bright stars of the constellation Ursa Major; six of them are of second magnitude and one, Megrez (δ), of third magnitude. ... 
The constellation of Ursa Major (Latin: Greater Bear) has been seen as a bear, a wagon, or a ladle.