cTh is a eTe?

[RadioFM]

That's fine. Personally my guess is that, if it's a cipher + not a synthetic language, these two labels encode almost the same word. Not necessarily the name of a (classical) planet or a place. E.g. the Taurinensis MS mentioned in René's site had attributes for labels in a similar wheel chart, and T-O diagrams with non-geographical labels have also been found

[ololololo]

In the upper example with f34r, if we ignore the specifics of the first words, it seems that epch should look like cPHh.
Other examples are also similar to chcKhy and chcThy, just without the line on the gallows.
Perhaps this is a hint pointing to scribe's mistake, but there’s also a possibility that there’s simply no difference between these words.