Expression is related to Sigh. Sigh is related to Huge. Huge is related to Big. Big is related to Hope. 
Relieve is derived from Relief. Relief is related to Mountain. Mountain is related to Point. 
Expression <--RelatedTo--> Sigh <--RelatedTo--> Huge <--RelatedTo--> Big <--RelatedTo--> Hope 
Relieve --DerivedFrom--> Relief <--RelatedTo--> Mountain <--RelatedTo--> Point 