Is buttonhole stitch the same as blanket stitch?

Blanket stitch and buttonhole stitch are the same stitch, technically. They are formed exactly the same way. The tailor’s buttonhole stitch is a completely different stitch altogether, as it is formed differently, and in no historical reference do we see “buttonhole stitch” illustrated with an extra knot.

THIS IS EXCITING:  What does the word bead mean originally?