βασιλεύς
basileus
bas-il-yooce'
Probably from G939 (through the notion of a foundation of power); a sovereign (abstractly, relatively or figuratively)
KJV Usage: king.
G932 βασιλείαβασιλεία
basileia
bas-il-i'-ah
From G935; properly royalty, that is, (abstractly) rule, or (concretely) a realm (literally or figuratively)
KJV Usage: kingdom, + reign.
G936 βασιλεύωβασιλεύω
basileuō
bas-il-yoo'-o
From G935; to rule (literally or figuratively)
KJV Usage: king, reign.
G937 βασιλικόςβασιλικός
basilikos
bas-il-ee-kos'
From G935; regal (in relation), that is, (literally) belonging to (or befitting) the sovereign (as land, dress, or a courtier), or (figuratively) preeminent