So I downloaded the Interlinear scripture analyzer and I've been playing around with it. I compared Psalms 102:26 to Psalms 146:4. Both of these use the word perish. They are "will perish" and "do perish" respectively.
They both use the same Strong's reference number, H6. But the WLC lists two different versions of the word. Ps 102 has iabdu and Ps 146 uses abdu.
Anywho, I was wondering if I'm doing this right. In both scriptures, the object being discussed, will perish. The earth and the thoughts of the one who goes back to the ground.