Drive is a synonym of Motor. Motor is related to Boat. Boat is related to Wet. 
Sack is related to Cloth. Cloth is related to Size. Size is related to Increase. Increase is a synonym of Inflation. 
Drive <--Synonym--> Motor <--RelatedTo--> Boat <--RelatedTo--> Wet 
Sack <--RelatedTo--> Cloth <--RelatedTo--> Size <--RelatedTo--> Increase <--Synonym--> Inflation 