Strong's #5392: neshek (pronounced neh'-shek)
 from 5391; interest on a debt:--usury.
Brown-Driver-Briggs Hebrew Lexicon:
 ׁ 
  neshek 
 
 1) interest, usury
 
  Part of Speech: noun masculine
Relation: from H5391
Usage:
This word is used 12 times:
Exodus 22:25: "neither shalt thou lay upon  him usury."
Leviticus 25:36: "Take thou no  usury of him, or increase: but fear thy God;"
Leviticus 25:37: "give him thy money  upon usury, nor lend him thy victuals for increase."
Deuteronomy 23:19: "Thou shalt not lend upon usury to thy brother;  usury of money, usury of victuals, usury"
Deuteronomy 23:19: "to thy brother; usury of money,  usury of victuals, usury of any thing"
Deuteronomy 23:19: "of money, usury of victuals,  usury of any thing that is lent upon usury:"
Psalms 15:5: "He that putteth not out his money  to usury, nor taketh reward against"
Proverbs 28:8: " He that by usury and unjust gain increaseth his substance, he shall gather it for him that will pity the poor."
Ezekiel 18:8: "He that hath not given forth  upon usury, neither hath taken any increase, that hath withdrawn his hand"
Ezekiel 18:13: "Hath given forth  upon usury, and hath taken increase: shall he then live? he shall not live: he hath done"
Ezekiel 18:17: "from the poor, that hath not received  usury nor increase, hath executed my judgments,"
Ezekiel 22:12: "shed blood; thou hast taken  usury and increase, and thou hast greedily gained of thy neighbors by extortion,"