'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'
hayah (Hebrew #1961)
to exist, i.e. be or become, come to pass (always emphatic, and not a mere copula or auxiliary)
KJV usage: beacon, X altogether, be(-come), accomplished, committed, like), break, cause, come (to pass), do, faint, fall, + follow, happen, X have, last, pertain, quit (one-)self, require, X use.
Pronounce: haw-yaw
Origin: a primitive root (compare 1933)