1: νουθετέω
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(Strong's #3560 — Verb — noutheteo — noo-thet-eh'-o )

"to put in mind, warn," is translated "to warn" in the AV, in the passages mentioned under ADMONISH, B, No. 1 (which see); the RV always translates this word by the verb "to admonish."

2: ὑποδείκνυμι
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(Strong's #5263 — Verb — hupodeiknumi — hoop-od-ike'-noo-mee )

primarily, "to show secretly" (hupo, "under," deiknumi, "to show"), hence, generally, "to teach, make known," is translated "to warn" in Matthew 3:7; Luke 3:7; 12:5 , RV (AV, "forewarn"). See FOREWARN , Note, SHEW.

3: χρηματίζω
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(Strong's #5537 — Verb — chrematizo — khray-mat-id'-zo )

for which see ADMONISH , B, No. 3, is translated "to warn" in Matthew 2:12,22; Acts 10:22; Hebrews 8:5 , RV (AV, "admonished"); 11:7; 12:25, RV (AV, "spake").