Theoretical is similar to Academic. Academic is a type of Researcher. Scientist is a type of Researcher. Astronomer is a type of Scientist. 
General is related to Heat. Heat is related to Steam. Steam is the opposite of Dry. 
Theoretical <--SimilarTo--> Academic --IsA--> Researcher <--IsA-- Scientist <--IsA-- Astronomer 
General <--RelatedTo--> Heat <--RelatedTo--> Steam <--Antonym--> Dry 