Isolate is a type of Get. Get is a synonym of Start. Start is related to Bottom. 
Field is related to Medicine. Vitamin is a type of Medicine. Vitamin is etymologically related to Vital. Vital is a synonym of Critical. 
Isolate --IsA--> Get <--Synonym--> Start <--RelatedTo--> Bottom 
Field <--RelatedTo--> Medicine <--IsA-- Vitamin --EtymologicallyRelatedTo--> Vital <--Synonym--> Critical 