Which word do you use?
Growing up, we used to say settee, but at some point, we switched to sofa. I'm a Londoner, but my mum was from the Midlands, so I think that was a regional thing we got from her.
Sofa. Grew up on the Midlands and now living i down South. I don't think I'd be surprised if someone said settee or sofa. I would with couch for some reason, maybe it is the American way