Letter is related to Love. Leave is etymologically related to Love. 
Supporter is related to Fan. Fan is related to Electronic. Electronic is related to Vacuum. Vacuum is related to Tool. 
Letter <--RelatedTo--> Love <--EtymologicallyRelatedTo-- Leave 
Supporter <--RelatedTo--> Fan <--RelatedTo--> Electronic <--RelatedTo--> Vacuum <--RelatedTo--> Tool 