constellation
The word that is used for a group of stars in the night sky is a star cluster.
a constellation is a group of stars and a star is one star
The word "star" only has one syllable.
No
The word group has one syllable.
Starfish is ONE word
One.
one.
The word group has one syllable.
The phrase 'movie star' is two words.
one
The term is almost always hyphenated all-star.