Grave is related to Hole. Hole is related to Button. Button is related to Belly. Belly is related to Gut. 
Ear is part of Corn. Ear is related to Fear. 
Grave <--RelatedTo--> Hole <--RelatedTo--> Button <--RelatedTo--> Belly <--RelatedTo--> Gut 
Corn <--PartOf-- Ear <--RelatedTo--> Fear 