Fundamental is similar to Significant. Significant is a synonym of Crucial. 
Limited is the opposite of Absolute. Absolute is related to Black. Hole can be used for Black. Hole is related to Bury. 
Fundamental <--SimilarTo--> Significant <--Synonym--> Crucial 
Limited <--Antonym--> Absolute <--RelatedTo--> Black <--UsedFor-- Hole <--RelatedTo--> Bury 