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The tag for ordinary should be made a synonym for penny farthing or vice verse. Technically, ordinary is the correct bike geek term but most people know them as penny farthings.
Try tagging something with a synonom ("ordinary" in this case) and the SE backend will put in the root synonom tag. Note its not a bidirectional link.
Can't post images in a comment, sorry
Update - this has been approved and is now live.