Twist is a different concept from Straight. Straight is related to Vertical. Vertical is a type of Orientation. Quarter is a type of Orientation. 
Model is a synonym of Construct. Construct is a synonym of Concept. Property is a type of Concept. 
Twist <--DistinctFrom--> Straight <--RelatedTo--> Vertical --IsA--> Orientation <--IsA-- Quarter 
Model <--Synonym--> Construct <--Synonym--> Concept <--IsA-- Property 