Consultant
WordNet
noun
(1) An expert who gives advice
"An adviser helped students select their courses"
"The United States sent military advisors to Guatemala"
WiktionaryText
Etymology
From , ppr. of < , frequentative of < + , of uncertain origin.
Noun
- a person or party that is consulted.
- a person whose occupation is to be consulted for their expertise, advice, or help in an area or specialty. Alternatively, a party whose business is to be similarly consulted.