|Huh, sounds like tag aliases (if that was what you meant, anyway). Thankfully, that exists already! Here: https://gelbooru.com/index.php?page=alias&s=list. |
Tag aliases are usually used to help consolidate pictures from multiple tags (that cover the same thing) into larger, more general tags for easier searching and less confusion. Some examples:
Differing wording for similar terms/ items: thigh_highs -> thighhighs / dickgirl -> futanari
Typos and misspellings: bukake -> bukkake / onepiece -> one_piece
Slang words: dick -> penis / boobs -> breasts
Nearly identical tags: side_tie_bikini -> side-tie_bikini
You're also free to make a tag alias request if you want.