Strong’s Greek
G5580 — pseudochristos
The entry below is Strong’s own definition (1890, public domain), and every verse where the word occurs.
ψευδόχριστος
pseudochristos — pronounced psyoo-dokh'-ris-tos
from 5571 and 5547; a spurious Messiah:--false Christ. see GREEK for 5571 see GREEK for 5547
2 occurrences in the KJV.
Matthew 24:24
For there shall arise false Christs, and false prophets, and shall shew great signs and wonders; insomuch that, if it were possible, they shall deceive the very elect.
Mark 13:22
For false Christs and false prophets shall rise, and shall shew signs and wonders, to seduce, if it were possible, even the elect.