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.
It's not an English word. joder <- the Urban Dictionary version joder - Wiktionary If you mean the reverse of the question that you asked, something like What English word means the same thing as joder? In that case, answers are there in the first link. They probably won't like the post in Quora.