der Star
star
A very famous and successful person, especially in film, music, or sports.
Dieser Schauspieler ist ein international gefeierter Star.
This actor is an internationally celebrated star.

star / starling / cataract
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star
A very famous and successful person, especially in film, music, or sports.
Dieser Schauspieler ist ein international gefeierter Star.
This actor is an internationally celebrated star.

The context makes clear which 'Star' is meant. If it is about film, music, or sports, it is a famous person. In texts about nature, it is the bird. In a medical context, it is an eye disease.
Dieser Sänger wurde über Nacht zum Star.
This singer became a star overnight.
The meaning 'berühmte Person' (famous person) was borrowed from English. The meanings 'Vogel' (bird) and 'Augenkrankheit' (eye disease), however, are original German words. This explains the major differences in meaning.
Es ist faszinierend, wie ein Wort so verschiedene Dinge bedeuten kann wie der Star.
It is fascinating how one word can mean such different things as 'der Star'.
In medical contexts, 'Star' is almost always used in the fixed terms 'der Graue Star' (cataract) or 'der Grüne Star' (glaucoma). The word rarely stands alone here.
Eine Operation wegen des Grauen Stars ist heutzutage ein Routineeingriff.
Surgery for cataracts is a routine procedure nowadays.
As a famous person, 'Star' is often combined with a field to form a compound, e.g. 'Filmstar' (film star), 'Popstar' (pop star), or 'Fußballstar' (football/soccer star). The phrase 'zum Star werden' (to become a star) is also very common.
Durch diese Rolle wurde sie über Nacht zum gefeierten Filmstar.
Through this role, she became a celebrated film star overnight.
god
'Gott' and 'Star' can both refer to a person who is greatly admired. 'Star' is the normal term for a famous and successful person, for example in music, film, or sports. 'Gott' is used in this context only figuratively and more strongly: the person is almost excessively revered, as if they were more than a normal human being. So 'Star' describes fame, while 'Gott' describes extreme admiration.

Nach dem Konzert gab der Star noch Autogramme vor der Halle.
After the concert, the star signed autographs outside the hall.
Für viele Fans war der alte Stürmer ein Gott des Fußballs.
For many fans, the old striker was a god of football.