Carbohydrate is related to Grain. Grain is related to Crop. Crop is related to Land. Land is related to Sand. 
Civilian is similar to Civil. Civil is a synonym of Civic. 
Carbohydrate <--RelatedTo--> Grain <--RelatedTo--> Crop <--RelatedTo--> Land <--RelatedTo--> Sand 
Civilian <--SimilarTo--> Civil <--Synonym--> Civic 