I've seen references lately to the use of both of these terms to mean the same thing. Jim Schollmeyer and Ted Leeson show the title to one of their more popular books as The Fly Tier's Benchside Reference, while a popular fly tying supply company is called the Fly Tyer's Dungeon. So which is it? Or are they both interchangeable?

Even my spell-check shows problems with tyer over tier.

Just wondering...

Kelly.