Highway is related to Bridge. Bridge is related to Cross. Cross is related to Place. Place is a synonym of Site. 
Mere is a synonym of Sheer. Sheer is a synonym of Vertical. Vertical is related to Post. Post is related to Future. 
Highway <--RelatedTo--> Bridge <--RelatedTo--> Cross <--RelatedTo--> Place <--Synonym--> Site 
Mere <--Synonym--> Sheer <--Synonym--> Vertical <--RelatedTo--> Post <--RelatedTo--> Future 