Prompt is a synonym of Inspire. Inspire is a synonym of Cheer. Cheer is related to Happy. 
Agreement is related to Peace. Peace is a type of Treaty. Treaty is related to Peaceful. 
Prompt <--Synonym--> Inspire <--Synonym--> Cheer <--RelatedTo--> Happy 
Agreement <--RelatedTo--> Peace --IsA--> Treaty <--RelatedTo--> Peaceful 