These two homonyms have different meanings.
ASSENT
The noun assent means agreement.
Examples: Your assent is required before we can go on with the procedures.
Your agreement is required before we can go on with the procedures.
As a verb, assent means to agree or to concur .
Examples: Unless you agree, we will not follow her path.
Unless you assent, we will not follow her path .
ASCENT
Ascent is derived from the verb ascend, which means to move forward, climb something or move to a higher level. Ascent is the noun version of ascend
Examples : His ascent is really getting to his head (his elevation to a higher level)
After his ascent to the top of the mountain, he dropped a rope for us to ascend.
