balah (Hebrew #1086)
to fail; by implication to wear out, decay (causatively, consume, spend)
KJV usage: consume, enjoy long, become (make, wax) old, spend, waste.
Pronounce: baw-law'
Origin: a primitive root
kalah (Hebrew #3615)
to end, whether intransitive (to cease, be finished, perish) or transitived (to complete, prepare, consume)
KJV usage: accomplish, cease, consume (away), determine, destroy (utterly), be (when ... were) done, (be an) end (of), expire, (cause to) fail, faint, finish, fulfil, X fully, X have, leave (off), long, bring to pass, wholly reap, make clean riddance, spend, quite take away, waste.
Pronounce: kaw-law'
Origin: a primitive root