Choose the word which is different from the rest.

Cygnus
Orion
Scorpio
Cassiopeia E. Vega

The answer is E. Vega.

The other four options are all constellations, while Vega is a star.

A constellation is a group of stars that form an imaginary outline or pattern on the celestial sphere, typically representing an animal, mythological person, or object. There are 88 recognized constellations, and they are used to help identify stars and planets in the night sky.

Vega is a star in the constellation Lyra. It is the brightest star in the constellation and the fifth brightest star in the night sky. Vega is a blue-white star and is about 25 light-years from Earth.

I hope this helps!