Strong's #4074: Petros (pronounced pet'-ros)
 apparently a primary word; a (piece of) rock (larger than 3037); as a name, Petrus, an apostle:--Peter, rock. Compare 2786.
Thayer's Greek Lexicon:
 ́ 
 
  Petros 
 
 Peter = "a rock or a stone" 
 1) one of the twelve disciples of Jesus
 
  Part of Speech: noun proper masculine
Relation: apparently a primary word
  Citing in TDNT: 6:100, 835
 
Usage:
This word is used 162 times:
Acts 12:14: "And when she knew  Peter's voice, she opened not the gate"
Acts 12:14: "but ran in, and told  how Peter stood before the gate."
Acts 12:16: "But  Peter continued knocking: and when they had opened the door, and saw him,"
Acts 12:18: "what was become  of Peter."
Acts 15:7: "when there had been much disputing,  Peter rose up, and said unto them,"
Galatians 1:18: "to Jerusalem to see  Peter, and abode with him"
Galatians 2:7: "unto me, as the gospel of the circumcision  was unto Peter;"
Galatians 2:8: "(For he that wrought effectually  in Peter to the apostleship of the circumcision, the same was mighty"
Galatians 2:11: "But when  Peter was come to Antioch, I withstood him"
Galatians 2:14: "truth of the gospel, I said  unto Peter before them all, If"
1 Peter 1:1: " Peter, an apostle of Jesus Christ, to the strangers scattered throughout Pontus, Galatia,"
2 Peter 1:1: "Simon  Peter, a servant and an apostle of Jesus Christ, to them that have obtained"