A — 1: ἐγκάθετος
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(Strong's #1455 — Adjective — enkathetos — eng-kath'-et-os )

an adjective denoting "suborned to lie in wait" (en, "in," kathiemi, "to send down"), is used as a noun in Luke 20:20 , "spies." In the Sept., Job 19:12; 31:9 .

A — 2: κατάσκοπος
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(Strong's #2685 — Noun Masculine — kataskopos — kat-as'-kop-os )

denotes "a spy" (kata, "down," signifying "closely," and skopeo, "to view"), Hebrews 11:31 .

B — 1: κατασκοπέω
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(Strong's #2684 — Verb — kataskopeo — kat-as-kop-eh'-o )

"to view closely" (akin to A, No. 2), "spy out, search out" with a view to overthrowing, is used in Galatians 2:4 . In the Sept., 2—Samuel 10:3; 1—Chronicles 19:3 .