Encourage is a synonym of Reinforce. Mine is a type of Reinforce. Mine is related to Cave. 
Poke is a synonym of Bag. Bag is related to Hand. Hand is related to Thumb. 
Encourage <--Synonym--> Reinforce <--IsA-- Mine <--RelatedTo--> Cave 
Poke <--Synonym--> Bag <--RelatedTo--> Hand <--RelatedTo--> Thumb 