Slip is related to Movement. Movement is related to Chew. 
Pin is related to Nail. Nail is a synonym of Screw. Screw is a type of Tighten. Strain is a type of Tighten. 
Slip <--RelatedTo--> Movement <--RelatedTo--> Chew 
Pin <--RelatedTo--> Nail <--Synonym--> Screw --IsA--> Tighten <--IsA-- Strain 