What is the difference between an attachment and an implement?
Since I used both terms in my post it must be up to me to give it a shot:
Attachment: Generally, a tool not used for direct chores. Possible multiple uses. Something that more indirectly accomplishes a task. Fastened to the tractor.
I.E. - counterweight, trailer hitch, carryall, quick hitch, must be directly attached to tractor. Other tools mounted to the front or FEL. I.E. - bucket, snowblower, forks (of any kind), boom.
Implement: Used for specific farming tasks. Most commonly ground engaging. I.E. - tiller, disc, PHD, blade, subsoiler, mower (either 3PH or pull), land-leveler, other general ground-engaging tools. Mounted or pulled on the rear.
Is this full of holes? Absolutely. Feel free to flame away. But if someone as knowledgeable as MtnViewRanch asks, even rhetorically, there must be a definition other than out of a dictionary.
Maybe the OP can clarify what he was thinking when using the term.