Purrsistant: when you not paying attention has no effect on the kitty purring
Purrmeable: that second level purr that sets in as you stroke the kitty's head or back
Purrogative: when the kitty decide to purr for no reason
Purrdom: creationist kitty
Purrplosive: when purrmeable feels so good it turns to meow
Purrplexed: when even the kitty doesn't know why it's purring
Purrsecution: when a purrsistant kitty won't leave you alone
Purrhana: a vicious form of purrsecution
Purrole: when a kitty decide to purrsicute some other family member
Purrometer: a must-have scientific device for measuring purr. When it's off the scale it's too much cute
Purrty: when the entire family is gathered, so the kitty can choose a victim at random. Also, when a litter of kitties purr in choir.