학식이 · 학식을
learning, scholarship, erudition
Example
그는 학식이 풍부하고 인품도 훌륭해요.
He is very learned and has a fine character.
Word parts
학 learning+식 know
Literally 'learning and knowledge'.
Good to know
Homonym: students also say 학식 for a school cafeteria meal (from 학생 식당).