Strong's #3520: nesos (pronounced nay'-sos)
 probably from the base of 3491; an island:--island, isle.
Thayer's Greek Lexicon:
 ͂ 
 
  nēsos 
 
 1) an island
 
  Part of Speech: noun feminine
Relation: probably from the base of G3491
 
Usage:
This word is used 9 times:
Acts 13:6: "And when they had gone through the  isle unto Paphos, they found a certain"
Acts 27:26: "be cast upon a certain  island."
Acts 28:1: "they knew that the  island was called Melita."
Acts 28:7: "were possessions of the chief man of the  island, whose name was Publius;"
Acts 28:9: "diseases in the  island, came, and were healed:"
Acts 28:11: "which had wintered in the  isle, whose sign was Castor and Pollux."
Revelation 1:9: "was in the  isle that is called Patmos, for the"
Revelation 6:14: "every mountain and  island were moved out of their places."
Revelation 16:20: "And every  island fled away, and the mountains were not found."