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I'm not quite sure what captain-crud means by the second half of his post either, but Smash does make all attacks AP2. The rule itself states that all close combat attacks gain AP2 (unless a weapon would give them AP1) and in addition the model may elect to make a Smash Attack which has other effects.

In regards to the Bonesword, it actually doesn't confer AP2 but simply ignores armor. And yes, on the Tyrant it is generally kept purely for the Lash Whip half of the weapon combo, though on the infantry units that can take them (Tyrant Guard, Warriors/Shrikes) the ignore armor effect is valuable.

Edit: Drat. Beat me to it...