Indigenous is the opposite of Foreign. Foreign is related to Alien. Alien is related to Bug. 
Vast is the opposite of Minute. Minute is related to New. New is related to Elect. 
Indigenous <--Antonym--> Foreign <--RelatedTo--> Alien <--RelatedTo--> Bug 
Vast <--Antonym--> Minute <--RelatedTo--> New <--RelatedTo--> Elect 