Deceiver

Vine's Expository Dictionary of NT Words

1: Πλάνος (Strong'S #4108 — Adjective — planos — plan'-os )

is, properly, an adjective, signifying "wandering, or leading astray, seducing,"  1—Timothy 4:1 , "seducing (spirits);" used as a noun, it denotes an impostor of the vagabond type, and so any kind of "deceiver" or corrupter,  Matthew 27:63;  2—Corinthians 6:8;  2—John 1:7 (twice), in the last of which the accompanying definite article necessitates the translation "the deceiver," RV. See Seduce.

2: Φρεναπάτης (Strong'S #5423 — Noun Masculine — phrenapates — fren-ap-at'-ace )

akin to C, No. 3, under DECEIVE, lit., "a mind-deceiver," is used in  Titus 1:10 .

 Revelation 12:9Deceive

King James Dictionary

DECE'IVER, n. One who deceives one who leads into error a cheat an impostor.

Webster's Dictionary

(n.) One who deceives; one who leads into error; a cheat; an impostor.