Speculate is a type of Reason. Reason is related to Propose. Propose is related to Idea. 
Balanced is similar to Stable. Stable is a type of Building. Building is related to Part. 
Speculate --IsA--> Reason <--RelatedTo--> Propose <--RelatedTo--> Idea 
Balanced <--SimilarTo--> Stable --IsA--> Building <--RelatedTo--> Part 