What is the term for this definition?

Question

I am trying to find the term used to describe "words that are spelled differently but spelled with the same letters". Examples would be:

~ Brad - Drab

~ Owl - Low

~ Leg -- Gel

Not words that are spelled backwards, just ones that use the same letters to spell different words.

Answer 1

Those are permutations.

Answer 2

anagrams

Answer 3

homonyms?