BUR #15699 has been approved by @evazion.
create alias semicircular_eyewear -> semi-circular_eyewear
Based on an advice from a higher-ranking user (thanks in advance), I'd rather make more BURs instead of manually renaming underpopulated, yet useful tags. The reason is simple, spelling standardization. For the same way we have semi-rimless eyewear. Further suggestions are indeed welcomed.