We have some questions tagged circularsaw. The tag should really be circular-saw since it's written as two words, not one. We also have several other saw tags that have the hyphen: band-saw, hand-saw, hole-saw.
Consistency with both the actual terminology of the trade, and with the rest of how the community is tagging similar elements, is always a handy thing to have with a tag system. I've performed the retag for now and instituted a synonym - if we ever want to revisit this, it's easy to reverse, too.