marar (Hebrew #4843)
properly, to trickle (see 4752); but used only as a denominative from 4751; to be (causatively, make) bitter (literally or figuratively)
KJV usage: (be, be in, deal, have, make) bitter(-ly, - ness), be moved with choler, (be, have sorely, it) grieved(-eth), provoke, vex.
Pronounce: maw-rar'
Origin: a primitive root
mar (Hebrew #4751)
from 4843; bitter (literally or figuratively); also (as noun) bitterness, or (adverbially) bitterly
KJV usage: + angry, bitter(-ly, -ness), chafed, discontented, X great, heavy.
Pronounce: mar
Origin: or (feminine) marah {maw-raw'}