Advisor is most commonly used in formal contexts, such as academia, politics, and finance.

HBO stuck the landing by refusing to alter course from the Mad Queen she has honestly and openly been from the start! Losing her closest advisors & allies only underlined how dangerous she has always been down to her bones

…ever since we first laid eyes on Selina Meyer. #Veep

— Moisés Chiullán (@moiseschiu) May 13, 2019

PhD applicants: Research topic and funding is important, but finding a great supervisor is essential. Find someone who will guide, challenge, support and listen to you, and be encouraging but also realistic. Ultimately it’s your advisors you learn from @AcademicChatter #phdadvice

— Lucy Thomas 🔭🌌 (@gravywavylucy) February 29, 2020

AP Style tip: use adviser, not advisor: The president and his advisers consulted at the White House.

— AP Stylebook (@APStylebook) September 11, 2013

Did you mean adviser?