I like optometrist, but only if you pronounce it with emphasis on the wrong syllables, like opto from "opto-couple" and metrist with the emphasis on the E.

opto-mEtrist.
I am also a fan of the *-able words, like: comfortable, washable, visible, debatable. They have quite varied meanings but all in some way are enabled to perform or provide the word they modify: comfort, wash, vision and debate.
There are MANY examples and I particularly enjoy making up my own, such as: Sometimes you can be so idiotable; that place is always funable; that guy's face is just SO punchable.