Overtake (v.) means to catch up with something and then pass it. This can be in terms of movement/physical speed, or in terms of getting higher numbers:
With a final burst of speed, Gary overtook Paul and won the race.
The number of women in college has now overtaken the number of men.
Sales of the new product will likely overtake sales of the old product by the end of the year. (in these last two examples, we can also use "surpass")
To take over (v.) means to take control - one country can take over another country with military force; when a big company buys a smaller company, it takes over the management of the smaller company. The verb take over is two words, and the noun, referring to the action of taking control, is takeover.
This mound of shimmering spheres looks like snowballs just waiting to be thrown. Arranged in an urn beside the front door, the spheres are plugged into a power strip hidden inside, then stacked and accented with boxwood greenery. A single strand of fishing line wrapped around the spheres keeps the stack secure.