Curtain is a synonym of Shade. Shade is related to Eye. Eye is related to Mechanism. Mechanism is related to Handle. 
Homeless is related to Adopt. Adopt is related to Service. 
Curtain <--Synonym--> Shade <--RelatedTo--> Eye <--RelatedTo--> Mechanism <--RelatedTo--> Handle 
Homeless <--RelatedTo--> Adopt <--RelatedTo--> Service 