Course is related to Curriculum. you are likely to find Curriculum in/at/on Classroom. Classroom can be used for Teach. Lecture is a type of Teach. 
Cheek is a synonym of Lip. 
Course <--RelatedTo--> Curriculum --AtLocation--> Classroom --UsedFor--> Teach <--IsA-- Lecture 
Cheek <--Synonym--> Lip 