akin to the base of κελεύω; to "call" (properly, aloud, but used in a variety of applications, directly or otherwise):--bid, call (forth), (whose, whose sur-)name (was (called)).
from ἀποστέλλω; a delegate; specially, an ambassador of the Gospel; officially a commissioner of Christ ("apostle") (with miraculous powers):--apostle, messenger, he that is sent.