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There's a disparity with using crochet and crocheting. They're used about 50/50 on questions right now, sometimes doubled up.
It seems like the best bet for tags like these is to make the synonyms, but no one in the community really has that ability yet.
But a tag synonym is not needed. Synonyms were designed for when there are two completely different words to describe a concept (e.g. car → auto). When two words have the same root, text completion will show them which is correct.
croc → crocheting