Room is related to Couch. Couch is related to Comfortable. Comfortable is similar to Sufficient. 
Adult is a different concept from Youth. Youth is a synonym of Kid. Kid is related to Junior. 
Room <--RelatedTo--> Couch <--RelatedTo--> Comfortable <--SimilarTo--> Sufficient 
Adult <--DistinctFrom--> Youth <--Synonym--> Kid <--RelatedTo--> Junior 