Can you start a sentence with Or?

Yes, but it's not recommended.

Explanation:

Based on the experiences i have had with teachers, they don't seem to like the idea, as it doesn't sound very professional and academic. Try using synonyms like:

as a choice.

as a substitute.

as an alternative.

conversely.

either.

in other words.

in preference to.

in turn.

- "these rights are natural and god-given to all men equally." (i disagree cuz i kind of think it's 'a' but who knows.)