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Should we merge [replacement] and [substitutes] tags into the [substitutions] tag? [substitutions] seems to be very popular and the other 2 haven't been used much.
Unless I'm missing something, replacement and substitutes are already synonyms of substitutions - see its synonyms page. If for example you type replacement in the tag field, substitutions will show up instead (with an "also: replacement" below) and you'll end up with the right tag.