Thin is the opposite of Wide. Wide is related to Stretch. Stretch is related to Good. Good is related to Fellow. 
Foundation is a synonym of Rock. Rock is the opposite of Mineral. 
Thin <--Antonym--> Wide <--RelatedTo--> Stretch <--RelatedTo--> Good <--RelatedTo--> Fellow 
Foundation <--Synonym--> Rock <--Antonym--> Mineral 