That might be what I meant. I honestly don't know the difference. I'm thinking the feathery thing that goes on the hook.
Hooks are pretty much just the basic metal hook. Flies is probably what you meant. A lot of fly fishermen, at least the really devoted ones, pianstakingly tie their own flies. They have different flies for different types of fly fishing, different times of year, etc... There are also people who collect fishing lures, which are different than flies in design and construction, though I've seen lures that were obviously based off a fly design.
A couple of images to show the difference:
Flies, used for fly fishing trout. Designed to realistically resemble a tasty insect,
because trout are smarter than other fish.

Lures, used for catching bass and other stupid fish who think
"ooh, the pretty colors are moving...chomp"