Bicycle Mechanics - freewheel types?

I'm trying to build a fixie and I'm wondering about my old freewheel.
Searching the forums gave lots of info about 'threaded freewheels'... My one slots onto the hub (it's not a cassette tho) - is this still a threaded freewheel or some other more mysterious type? What does the 'threaded' refer to?
i'm very confused...

There is freehub and freewheel.

A freehub has the ratcheting mechanism(tick tick tick when you coast) built into the hub. The cogs and cog spacers(known all together as a cassette) have slots or grooves that match ridges on the hub and thus the cassette just slides onto the hub.

A freewheel is a part that has the ratcheting mechanism(same tick tick) in it and the cogs are slid, screwed, or some of both, depending on age and brandname, onto the freewheel part. This whole freewheel and cog combination is know simply as a freewheel. The whole freewheel and cog unit then screws onto a threaded hub, this is what threaded refers to.

thanks for clarifying that. I think (I've just realised) that the source of my confusion is the fact that the whole freewheel is broken off the hub, with the threaded part still inside the freewheel.
I'm sure it's a common source of confusion! :D

Whaaa?

how the heck did the whole freewheel break off of the hub? That's an awfully strong piece to break.

Could be an old Regina CX (83?) They had some problems with a few
manufacturung runs. Too bad, cause Regina's were by far and away the
best.

sun