Bulk is etymologically related to Bucket. Bucket is a type of Vessel. Vessel is related to Can. Can is the opposite of Jar. 
Sodium is related to Salt. Salt is related to Like. Like is related to Desert. Desert is related to Meal. 
Bulk --EtymologicallyRelatedTo--> Bucket --IsA--> Vessel <--RelatedTo--> Can <--Antonym--> Jar 
Sodium <--RelatedTo--> Salt <--RelatedTo--> Like <--RelatedTo--> Desert <--RelatedTo--> Meal 