Sometimes, people use different words to mean the same thing - the beauty of language. When this happens in real-life, your brain transforms it, but unfortunately, our website is not as cool as your brain.
So, we have a tag merging system. You can see the current rules below to see how this works. For example, search for any of the variations of "redhead", and you'll get the same results as if you had search for the official tag, "redhead". The theory works for applying or voting for tags: apply the tag "red-head" (with a hyphen), and we'll convert it to a vote for "redhead" automatically.