Consideration is a synonym of Circumstance. Circumstance is related to Trouble. Troubled is a form of Trouble. 
Safe is related to Small. Small is related to Word. Word is related to Paper. Tissue is a type of Paper. 
Consideration <--Synonym--> Circumstance <--RelatedTo--> Trouble <--FormOf-- Troubled 
Safe <--RelatedTo--> Small <--RelatedTo--> Word <--RelatedTo--> Paper <--IsA-- Tissue 