Posted under Tags
Most class/profession tags are like this. The second image there is also tagged assassin, which is just as junky a tag.
Certainly, someone looking for rogueish character images for their D&D character or something would have a hard time, but just plugging in rogue would net you a handful of useless results. But the idea of a "stealthy-looking leather-clad knife-wielding possibly smary and/or grungy person" is kinda hard to make a singular tag for, especially with constant canon tagging.
Much like Witch and Maid, class/profession tags, when they're not canon, are really just costume tags. And some of them either have a specific costume that is taggable or has too many disparate meanings and/or a fuckton of synonyms that they end up useless no matter how much we police them. I think this one and the synonyms mentioned fall into the latter.