Proper Name Formation

I was wondering what the proper rendering of the name "Master of the Pen" or "Pen-Master" would be in Sindarin. I've come up with Tegildur as a possible example, but my confusion originates from the name Túramarth ("Master of Doom"). With the element tûr being first, it would seem Túrdegil is also possible. Yet I still wonder which of the two would be the most appropriate.

Mastering the pen is rather different from mastering doom semantically speaking, we have an attested compound Tegilbor for someone skilled in calligraphy.

Makes sense. Then Tegildur would be the ideal rendering of the name.