Currently at the time of this post:
A synonym has been suggested already for the hbp and heated-bed tag. hbp was added to a single post, and in order to create a synonym there needs to be at least 5 posts containing the similar tags. Now that the synonym has been suggested, most of those posts with dual tags can be reduced back to just heated-bed.
Currently, (03/28/2016), we do not have any moderators to make these tasks easier to manage.
If the synonym suggestion is not accepted, then external searches may be hindered to only display results for the term heated-bed as opposed to heated-bed or hbp. So, if you have a chance to properly address a synonym, definitely do so as it will only help bring more users to the site.