Carrot is a type of Herb. Carrot is a type of Reward. Reward is related to Award. Award is related to Price. 
Sea can be used for Swim. Sea is related to Blue. Blue is related to Depression. Depression is related to Severe. 
Herb <--IsA-- Carrot --IsA--> Reward <--RelatedTo--> Award <--RelatedTo--> Price 
Swim <--UsedFor-- Sea <--RelatedTo--> Blue <--RelatedTo--> Depression <--RelatedTo--> Severe 