takeover (take over)
Overtake is a verb.
It can mean to go beyond something by being better, or if you're driving to come from behind another vehicle or a person and move in front of it.
For example: You should always check your rear view mirror before you overtake another car.
Takeover as a noun is used when one organisation gains control of a company by buying most of its shares.
For example: In September 2006 Merck announced their takeover of Serono SA.
Take over as a phrasal verb means to get control of a company by buying most of its shares.
For example: Merck finally took Serono over in 2007.