constellation
The group is known as a constellation.
a group of stars is galled a constellation
Group of stars forming patterns in the sky is called constellation. However, not every group of stars is a constellation. The constellations standardized and given names long ago. The grouping is based entirely on the apparent arrangement of the stars from earth.
in astronomy, asterism is when stars APPEAR to be forming a picture or pttern.
it is called a nebula
I think you are referring to a cluster of stars.
The group of stars is called Constellation. I think it's cluster.
Such an image made up of stars is called an asterism. Sometimes also a constellation - though the current official definition of constellation is unrelated to specific stars.
It is a good example of a constellation - a group of stars forming a recogniseable shape when viewed from Earth.
a nebula
A galaxy of stars
An Asterism.