יועץ

Etymology
The noun follows from the verb.

Noun

 * 1) An adviser or advisor one who gives advice.
 * 2) A consultant a person whose occupation is to be consulted for their expertise, advice, or help in an area or specialty.
 * 3) A counselor.
 * 4)  A counselor, a diplomat who usually ranks third in an embassy (below the ambassador and the minister).
 * 1)  A counselor, a diplomat who usually ranks third in an embassy (below the ambassador and the minister).