Cap is a type of Limit. Cap is a synonym of Pill. Pill can be used for Medicine. Medicine is related to Related. 
Skill is related to Act. Volunteer is a type of Act. Volunteer is related to Relief. Relief is a type of Comfort. 
Limit <--IsA-- Cap <--Synonym--> Pill --UsedFor--> Medicine <--RelatedTo--> Related 
Skill <--RelatedTo--> Act <--IsA-- Volunteer <--RelatedTo--> Relief --IsA--> Comfort 