Ocean is related to Half. Half is related to One. One is related to Foot. Foot is similar to Head. 
Charity is related to Care. Care is related to Assistance. Assistance is a synonym of Benefit. 
Ocean <--RelatedTo--> Half <--RelatedTo--> One <--RelatedTo--> Foot <--SimilarTo--> Head 
Charity <--RelatedTo--> Care <--RelatedTo--> Assistance <--Synonym--> Benefit 