ratsach (Hebrew #7523)
properly, to dash in pieces, i.e. kill (a human being), especially to murder
KJV usage: put to death, kill, (man-)slay(-er), murder(-er).
Pronounce: raw-tsakh'
Origin: a primitive root
'achar (Hebrew #310)
properly, the hind part; generally used as an adverb or conjunction, after (in various senses)
KJV usage: after (that, -ward), again, at, away from, back (from, -side), behind, beside, by, follow (after, -ing), forasmuch, from, hereafter, hinder end, + out (over) live, + persecute, posterity, pursuing, remnant, seeing, since, thence(-forth), when, with.
Pronounce: akh-ar'