Is won and one a synonym?

No, "won" and "one" are not synonyms. They are completely different words with different meanings and uses:

* Won is the past tense of the verb "win," meaning to be victorious or successful.

* One is a number representing a single unit or item.

Here's an example:

* "I won the race!" (meaning you were victorious)

* "There is one apple on the table." (meaning a single apple)