Pillar + enduring?

I'm working on a theoretical Quenya amilessë for Celebrìan, and I've narrowed it down to the idea of 'tarma-' as in pillar (as seen in 'meneltarma') and something meaning enduring/lasting strength - vórëa?

Would those together be Tarmavórë, Tarmavóra or something like Voretarma? And if there are any other words better than vórëa please let me know.