Invention is related to Practical. Practical is related to Being. Being is related to Energy. Energy is related to Inner. 
Design is related to Master. Master is related to Lock. Lock is a synonym of Engage. 
Invention <--RelatedTo--> Practical <--RelatedTo--> Being <--RelatedTo--> Energy <--RelatedTo--> Inner 
Design <--RelatedTo--> Master <--RelatedTo--> Lock <--Synonym--> Engage 