Specify is a type of Elaborate. Elaborate is a synonym of Expand. 
Airplane is related to Bird. Feather is part of Bird. you are likely to find Feather in/at/on Bid. 
Specify --IsA--> Elaborate <--Synonym--> Expand 
Airplane <--RelatedTo--> Bird <--PartOf-- Feather --AtLocation--> Bid 