Metal is related to Sign. Sign is a synonym of Trail. Trail is related to Ridge. 
Alone is the opposite of Others. Others is related to Advantage. Advantage is a type of Prefer. Prefer is a synonym of Favor. 
Metal <--RelatedTo--> Sign <--Synonym--> Trail <--RelatedTo--> Ridge 
Alone <--Antonym--> Others <--RelatedTo--> Advantage --IsA--> Prefer <--Synonym--> Favor 