Strong's #1010: bouleutes (pronounced bool-yoo-tace')
 from 1011; an adviser, i.e. (specially) a councillor or member of the Jewish Sanhedrin:--counsellor.
Thayer's Greek Lexicon:
 ́ 
 
  bouleutēs 
 
 1) a councillor, senator
 2) a member of the Sanhedrin
 
  Part of Speech: noun masculine
Relation: from G1011
 
Usage:
This word is used 2 times:
Mark 15:43: "of Arimathaea, an honorable  counselor, which also waited for"
Luke 23:50: "named Joseph, a  counselor; and he was a good man, and a just:"