The second one is charging hourly. We tend to prefer hourly fees on projects that are particularly open ended or very small scope. Our hourly rates are currently between $60 and $120 per hour depending on who is doing the work.
The word sonder exists, though. It means to probe, and in a more specific use, to test the depth of something. The word sound (as in the water feature) is a cognate, both related to the Old English sund meaning to swim, or the sea. I can't really think of an English equivalent that's specific beyond mere awareness.
Vader meaning father is easily plausible, if you don't blind yourself to the fact that Vader fathers the Galactic Empire - which, unlikely by coincidence, has striking resemblance to the Nazi Regime. Even if you argue against that, he can easily have been seen to be a father to something - an idea, a power - anything.