Mill is related to Ordinary. Ordinary is a different concept from Unique. Unique is similar to Unusual. 
Must is related to Desire. Hunger is a type of Desire. Hunger is related to Feel. Feel is related to Health. 
Mill <--RelatedTo--> Ordinary <--DistinctFrom--> Unique <--SimilarTo--> Unusual 
Must <--RelatedTo--> Desire <--IsA-- Hunger <--RelatedTo--> Feel <--RelatedTo--> Health 