Mental is related to Mind. Mind is related to Conscious. Conscious is a synonym of Awake. Awake is a different concept from Asleep. 
Small is related to Hill. Hill is related to Land. 
Mental <--RelatedTo--> Mind <--RelatedTo--> Conscious <--Synonym--> Awake <--DistinctFrom--> Asleep 
Small <--RelatedTo--> Hill <--RelatedTo--> Land 