alter
Another five-letter word for 'change' is 'alter.'
Change, specifically change from one thing into another.
change 'e' and you get noon
Reconsidered had a change of heart
morph
Another name would be to change the outcome or to change time.
an anagram is a word formed from another by scrambling the letters.
Obfuscation
Yes.
nickel
Edit
You can change the 'm' to a 't' to make wart.