Recall is a type of Cancel. Recall is a type of Concentrate. Remember requires Concentrate. Remember requires Repeat. 
Sick is the opposite of Ok. Ok is a form of Okay. 
Cancel <--IsA-- Recall --IsA--> Concentrate <--HasPrerequisite-- Remember --HasPrerequisite--> Repeat 
Sick <--Antonym--> Ok --FormOf--> Okay 