Invest is etymologically related to Investigate. Research is a type of Investigate. Scientist can Research. Theory is created by Scientist. 
Literature can be used for Professor. Literature is related to Form. Form is related to Money. Money is related to Fine. 
Invest --EtymologicallyRelatedTo--> Investigate <--IsA-- Research <--CapableOf-- Scientist <--CreatedBy-- Theory 
Professor <--UsedFor-- Literature <--RelatedTo--> Form <--RelatedTo--> Money <--RelatedTo--> Fine 