so that the tag names are self-descriptive and the tags themselves are easily found via the popular acronyms (used as synonyms).
OK, I've made the change you suggest.
Older Answer Below
I'd be tempted to go the other way: keep adc and dac and make the longer forms synonyms. Mainly because the shorter forms include "c" (for convertor), and adding that to the longer forms would make them a little long.