Cave can be used for Exploration. Exploration is a type of Search. 
Dominate is a synonym of Command. Command is related to Sign. Sign is a type of Evidence. Testimony is a type of Evidence. 
Cave --UsedFor--> Exploration --IsA--> Search 
Dominate <--Synonym--> Command <--RelatedTo--> Sign --IsA--> Evidence <--IsA-- Testimony 