what's the difference between "rescind" & "revoke"?
As far as I know both of these words are formal.So it's not case of formal-informal..

Question

Answer

No difference except the spelling

Answer

google revoke rescind ==>
https://wikidiff.com/rescind/revoke
==>
As verbs the difference between rescind and revoke is that 
rescind is to repeal, annul, or declare void; to take (something such as a rule or contract) out of effect while 
revoke is to cancel or invalidate by withdrawing or reversing.

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So rescind means the rule is now void, not used, no longer applied, but revoke means the rule no longer exists.
This seems rather subtle and similar in effect.

Answer

You can rescind something but some can revoke something from you.

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