Many do. One example: The middle of the 3 stars in the "handle" of the 'Big Dipper' is a visual double, whose components have been named Mizar and Alcor, or the "Horse and Rider" in Native American folklore. Both components are visible with sharp eyes and good resolving power.
Possibly a constellation or an asterism.
Antares is a red supergiant star and not a constellation or an asterism.
The term for an unofficial constellation is "asterism." These are recognizable star patterns that are not part of the recognized 88 official constellations.
Canis Major contains all types of stars, although B class stars are probably the most common of the asterism.
Asterism
Are you looking for the word "constellation?"
Yes - Cygnus is Latin for "swan" and Cygnus, the Swan's brightest star is located in it's tail - the star is named Deneb, which is an Arabic word meaning tail (go figure!). Deneb is the dimmest of the three stars that make up the asterism, The Summer Triangle - in the northern hemisphere.
It can be called a star cluster, an open cluster or an asterism.
Swati is the name of a/an star/asterism. It is a star during the ruling of which a rain could form pearls in oysters.
Dubhe is not a red giant but rather a subgiant star. It is the brightest star in the Big Dipper asterism and is classified as an evolved F-type subgiant star.
The color of the star Megrez is bluish-white. It is one of the main stars in the constellation Ursa Major and is part of the Big Dipper asterism.
A Star sapphire has an asterism, a star-like central feature- made this way by Nature. The regular Sapphire may or may not have this feature. Sapphires rate 9 on the Mohs scale of hardness, below Diamond but on the same plane as Ruby, and something familiar from the shop class- Carborundum.