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.
Here are all the possible meanings and translations of the word Solder. Princeton's WordNet(0.00 / 0 votes)Rate this definition: solder(verb) an alloy (usually of lead and tin) used when melted to join two metal surfaces. solder(verb) join or fuse with solder. solder these two pipes together. solder(Noun) Any of various alloys, often of tin and lead, that are used to join small pieces of metal together.