Reserve is related to Limit. Limit is related to Threshold. Threshold is a type of Sensation. Hunger is a type of Sensation. 
Distinct is the opposite of Identical. Identity is etymologically related to Identical. Identity is related to Number. 
Reserve <--RelatedTo--> Limit <--RelatedTo--> Threshold --IsA--> Sensation <--IsA-- Hunger 
Distinct <--Antonym--> Identical <--EtymologicallyRelatedTo-- Identity <--RelatedTo--> Number 