Pickup is related to Sound. Sound is related to Form. Strike is a type of Form. Strike is a synonym of Fall. 
Switch is related to Exchange. Exchange is related to Action. Action is related to Flash. Flash is related to Function. 
Pickup <--RelatedTo--> Sound <--RelatedTo--> Form <--IsA-- Strike <--Synonym--> Fall 
Switch <--RelatedTo--> Exchange <--RelatedTo--> Action <--RelatedTo--> Flash <--RelatedTo--> Function 