AGGEMAM said:And an unarmed strike is a subset of an unarmed attack, yes ?
No.
Generally, an unarmed strike is the result of an unarmed attack.
For a Monk, however, all previous definitions are off.
The problem is that no new definitions clearly replace the discarded old ones.
It is not clear what 'unarmed strike' means for a monk.
For a monk, 'unarmed strike' may very well mean 'unarmed attack' in its broadest sense, which includes unarmed Trip, Disarm, and Grapple attempts.
That's as tightly as I can place the parameters of the current discussion.
There are other implications however.
For example: the only other place that I can find where 'unarmed strike' refers to an attack action, rather than the result of an attack, is under the Weapon Focus Feat.
There 'unarmed strike' coud mean "a successful blow..."(wha?), "monk's unarmed strike" (which would mean that only monks may take this option on the Feat), "any unarmed attack that is not covered by another Feat" (which would mean that you can wield a wepon that leaves you unarmed), or "attacking with Improved Unarmed Strike" (which makes perfect sense).