Wood is related to Beam. Beam is related to Structural. 
Secular is the opposite of Frequent. Frequent is similar to Regular. Regular is related to Fellow. Fellow is related to Buddy. 
Wood <--RelatedTo--> Beam <--RelatedTo--> Structural 
Secular <--Antonym--> Frequent <--SimilarTo--> Regular <--RelatedTo--> Fellow <--RelatedTo--> Buddy 