I like to view transpiling as a specialization of compiling. Even if you try to make the distinction between high-level input -> low-level output, in the end it feels like the language matters much less than how the generated code is designed. Most "transpilers" end up using the bare minimum number of features for the target language and staying constrained to a pretty low-level part of that language. For example, languages that transpile to JavaScript tend to target asm.js, which really doesn't look anything like the JavaScript that real people write. Getting bogged down in naming differences when the overall process is pretty much identical is just ignoring the big picture in my mind.