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
katargeo (Greek #2673)
to be (render) entirely idle (useless), literally or figuratively
KJV usage: abolish, cease, cumber, deliver, destroy, do away, become (make) of no (none, without) effect, fail, loose, bring (come) to nought, put away (down), vanish away, make void.
Pronounce: kat-arg-eh'-o
Origin: from 2596 and 691