The "transfromation" synonym should be "transformation". That's just a typo, although it may have been lurking for a while. (I can't see a way to suggest an edit, except this one.)
I think this won't matter since transfromation is already a synonym of data-transformation. It might be that we need to create a new tag
[transformation] to also be a synonym of data-transformation, but only to preempt the possibility that someone will create that tag without people noticing it. However, that doesn't seem to have been an issue thus far; we can probably put that off until it actually occurs.