you are likely to find Feather in/at/on Pillow. Pillow is related to Cloud. Cloud is related to Gathering. 
Discovery is a synonym of Invention. Invention is related to Patent. 
Feather --AtLocation--> Pillow <--RelatedTo--> Cloud <--RelatedTo--> Gathering 
Discovery <--Synonym--> Invention <--RelatedTo--> Patent 