Tried googling it, but did not get any decent results.
When you are using Words of Power, and have the prerequisites for Spell Perfection, upon choosing it, do you choose any spellword to attach it to, an effect word, or can you simply not take advantage of the feat?
In the case of a sorcerer who has Spell Perfection and is able to attach it to a word, do you get to change what word Spell Perfection is attached to when you rearrange your spells each time you level up?
Spell Perfection, as written, is not compatible with Words of Power. Selecting it would require that you have some variety of standard casting spell. This is actually more common than you'd think because of Domains, Bloodlines, and Mysteries.
RAI would seem, going by how Wizards treat it, to apply to a specific combination of Words.