Period is related to Afternoon. Afternoon is the opposite of Noon. Noon is related to Hour. Hour is related to Chunk. 
Fault is a type of Crack. Crack is a synonym of Rock. Rock is related to Matter. 
Period <--RelatedTo--> Afternoon <--Antonym--> Noon <--RelatedTo--> Hour <--RelatedTo--> Chunk 
Fault --IsA--> Crack <--Synonym--> Rock <--RelatedTo--> Matter 