Rush is related to Hour. Hour is related to Chunk. Chunk is related to Year. Year is related to Day. 
Tree is related to Boat. Boat is related to Naval. 
Rush <--RelatedTo--> Hour <--RelatedTo--> Chunk <--RelatedTo--> Year <--RelatedTo--> Day 
Tree <--RelatedTo--> Boat <--RelatedTo--> Naval 