an (Greek #302)
a primary particle, denoting a supposition, wish, possibility or uncertainty
KJV usage: (what-, where-, wither-, who-)soever. Usually unexpressed except by the subjunctive or potential mood. Also contracted for 1437.
Pronounce: an
oun (Greek #3767)
(adverbially) certainly, or (conjunctionally) accordingly
KJV usage: and (so, truly), but, now (then), so (likewise then), then, therefore, verily, wherefore.
Pronounce: oon
Origin: apparently a primary word