I think we've illustrated the difficulty in assertaining where a tulwar becomes a Tegha quite nicely.
I'm getting a deja vu now.... either a glitch in the matrix or I've had this debate before.
So if a tegha is a broad curved sword and a tulwar is also a curved sword... both with the same hilt, both single edged...
Where is the line where a Tulwar can be described as Tegha?
I've already got my ideas, so I'll let others chime in before I throw them out there
But I will say that I've often wondered if Tegha aren't properly these and the term wasn't misapropriated for those exaggerated swords we now associate it with.