kai (Greek #2532)
and, also, even, so then, too, etc.; often used in connection (or composition) with other particles or small words
KJV usage: and, also, both, but, even, for, if, or, so, that, then, therefore, when, yet.
Pronounce: kahee
Origin: apparently, a primary particle, having a copulative and sometimes also a cumulative force
Kephas (Greek #2786)
the Rock; Cephas (i.e. Kepha), a surname of Peter
KJV usage: Cephas.
Pronounce: kay-fas'
Origin: of Chaldee origin (compare 03710)