Cancer is related to Smoke. Smoke is related to Give. Give is related to Explain. 
Narrow is related to Tight. Tight is the opposite of Full. Full is a synonym of Good. Good is a synonym of Sound. 
Cancer <--RelatedTo--> Smoke <--RelatedTo--> Give <--RelatedTo--> Explain 
Narrow <--RelatedTo--> Tight <--Antonym--> Full <--Synonym--> Good <--Synonym--> Sound 