A star cluster.
See related question
Constellations!
A group of stars. Constellations aren't actually connected stars.
constelltions
A galaxy.
A galaxy
Open cluster
A group of stars that form a picture is called a constellation. These patterns are recognized and named by different cultures around the world.
A small group of stars that appear to be close together are often known a cluster. Technically its an asterism.
a group of the stars
A collective noun for a group of stars is a cluster of stars (small group) and a galaxy of stars (large group).
It's called a constellation.
While some people may call them star clouds, other use the term star clusters. They refer to the same group of stars.