Big is similar to Senior. Senior is a synonym of Elderly. 
Brush is a type of Cover. Brush is a type of Fight. Fight is related to Wound. Wound is related to Blood. 
Big <--SimilarTo--> Senior <--Synonym--> Elderly 
Cover <--IsA-- Brush --IsA--> Fight <--RelatedTo--> Wound <--RelatedTo--> Blood 