adviser
/ədˈvaɪzə(r)/(亦作advisor)
noun
- a person who gives advice, typically someone who is expert in a particular field顾问（尤指特定领域里的专家）：
the military adviser to the President.
总统的军事顾问。
USAGE
The spellings adviser and advisor are both correct. Adviser is more common, but advisor is also widely used, especially in North America. Adviser may be seen as less formal, while advisor often suggests an official position.