A lot of people use BECAUSE and CAUSE interchangeably in spoken English.
I went home because it was late. (You can use this in both written and spoken English)
I went home cause it was late. (You can use this is spoke English only)
Another meaning that the word CAUSE has is:
– make something happen (verb)
Smoking causes lung disease.
– person or thing that give rise to an action (noun)
The cause of the accident was not clear.
– aim, principle, movement (noun)
He dedicated his life to an honorable cause – to help deaf people.