These two tags mean the same thing: The pointing device usually built into laptop computers. The tags for these should be merged.
Vote on the answers below for your preferred direction.
updating post history, 70 rows affected updating posts, 56 rows affected updating PostTags associations, 46 rows affected removing/renaming old tag, 0 rows affected updating count for master tag, 1 rows affected tag remapping of [touchpad] and [trackpad] complete! remapping 0 synonyms 1 favorite and ignored tags remapped! Tag Synonym trackpad -> touchpad was approved!
Don't create a synonym. Don't merge these tags.