Would is the opposite of Could. Could is related to Capable. Capability is derived from Capable. 
Wide is related to Empire. Empire is related to Kingdom. Kingdom is related to Nation. Nation is related to Whole. 
Would <--Antonym--> Could <--RelatedTo--> Capable <--DerivedFrom-- Capability 
Wide <--RelatedTo--> Empire <--RelatedTo--> Kingdom <--RelatedTo--> Nation <--RelatedTo--> Whole 