If the wall you show in the the above diagram is connected directly to the foundation, yes, a sill plate. If the wall is sitting on floor joists (platform framing) then it’s a shoe, sole, or bottom plate.
I’ve found regional differences in construction terminology, so talking to a few area contractors can clue you in on what terms are commonly used in your area.
It depends on the foundation type. On basement/crawlspace construction, the lowest horizontal framing member bolted to the foundation is the sill plate/mud sill. The bottom plate or sole plate is the lowest horizontal framing member of a stud wall. If the foundation is slab on grade(monolithic, stem wall, etc) then the lowest horizontal framing member acts as both the sole plate and sill plate. On a permanent wood foundation, the lowest framing member is the footing plate which takes place of the sill plate(cause it gets bolted directly to the footing hence the name), then you get the sole plate. The names could go on and on. It is best to reach out to local contractors and see what they call it, because hey, they are the ones that get to repair problems you identify with the framing anyways, so it helps if you are consistent with the language.