Sadly, I must now bow out of further word-listing, at least until most of the other players give up. As Paul C speculated in his post, there are indeed online resources that can help with this, and I've read some of their results. Consequently I think it's no longer fair for me to present answers as if they're things I thought of myself. Everything I posted previously came from my own memory. But now I've been corrupted by external sources.
I will offer one cryptic hint though:
There is at least one other seven-letter word, besides carbine, that I wish I'd though of myself. I think it's somewhat less obscure than carbine was. And oddly enough, I was kind of tempted to use the word in the preceding sentence. It's not quite so esoteric as carbine - and yet, in a sense, it's more obscure and esoteric than carbine.