Strong's #4142: ploiarion (pronounced ploy-ar'-ee-on)
 neuter of a presumed derivative of 4143; a boat:--boat, little (small) ship.
Thayer's Greek Lexicon:
 ́ 
 
  ploiarion 
 
 1) a small vessel, a boat
 
  Part of Speech: noun neuter
Relation: from a presumed derivative of G4143
 
Usage:
This word is used 6 times:
Mark 3:9: "to his disciples, that  a small ship should wait on him because of the"
Mark 4:36: "with him other  little ships."
John 6:22: "there was none other  boat there, save that one"
John 6:22: "went not with his disciples into the  boat, but that his"
John 6:23: "(Howbeit there came other  boats from Tiberias nigh unto the"
John 21:8: "other disciples came  in a little ship; (for they were not far"