Period is related to Past. Past is the opposite of Current. Current is related to Relevant. 
Scent is related to Soap. Soap is related to Fat. Fat is similar to Protein. Protein is related to Milk. 
Period <--RelatedTo--> Past <--Antonym--> Current <--RelatedTo--> Relevant 
Scent <--RelatedTo--> Soap <--RelatedTo--> Fat <--SimilarTo--> Protein <--RelatedTo--> Milk 