Impulse is a synonym of Force. Force is related to Light. 
Bed is related to Nest. Nest is related to Hay. Hay is a type of Convert. Flour is a type of Convert. 
Impulse <--Synonym--> Force <--RelatedTo--> Light 
Bed <--RelatedTo--> Nest <--RelatedTo--> Hay --IsA--> Convert <--IsA-- Flour 