From what I see of the definitions pointed to here, I would propose to turn the synonyms around.

 **@Vitaly Mijiritsky** commented that the classical definition of "copywriting" is mainly off-topic here.

 **@Patrick McElhaney** said in [his answer](http://meta.ux.stackexchange.com/questions/547/microcopy-and-copywriting-are-not-the-same-thing/548#548):

> .. it seems all of our [tag:copywriting] questions are about microcopy.

So maybe it should be that [tag:copywriting] should be re-tagged to [tag:microcopy], and not the other way around?