#4444 πύργος purgos {poor'-gos}

 apparently a primary word ("burgh"); TDNT - 6:953,980; n m

—Greek Word Study (Transliteration-Pronunciation Etymology & Grammar)

 1) a tower
 2) a fortified structure rising to a considerable height, to repel a
    hostile attack or to enable a watchman to see in every direction

—Thayer's (New Testament Greek-English Lexicon)

—Strong's (Greek Dictionary of the New Testament)

—NAS Exhaustive Concordance of the Bible with Hebrew-Aramaic and Greek Dictionaries

 AV - tower 4; 4

—Exhaustive Concordance (KJV Translation Frequency & Location)