These words mean to start to be something.
The word with the broadest use isbecome. It can be followed by an adjective or a noun.
My arm was becoming more and more painful.
Bill Clinton became president in 1993.
Getis a very common way of sayingbecome. It is only followed by an adjective.
Growis used to emphasize that the process is gradual. It is also followed by an adjective.
Tempers had been growing more and more frayed during the evening.
Goorturnare sometimes used when the change is seen as a negative one. They are both used with adjectives.
My hair is going white.
The sky turned black.