Currently, according to the tag wiki, rewrite is about URL rewriting, so they should be merged.
Maybe blacklist rewrite for ambiguity; otherwise synonymize.
closed as off-topic by Jack Douglas, Monica Cellio, cVplZ, Martijn Pieters, Shadow Wizard Aug 15 at 21:08
This question appears to be off-topic. The users who voted to close gave this specific reason:
Mostly rewrite is used for url-rewriting on Stackoverflow.
But there are many questions that have rewrite for file-rewriting. Rewrite means replacing subterms of a formula/code/string with other terms. So it would be create problem if we directly merge tags.
Some of questions are: