Distinct is the opposite of Identical. Identical is related to Copy. Copy is related to Document. Log is a type of Document. 
Pregnant is a synonym of Significant. Significant is the opposite of Slight. Slight is the opposite of Thick. Thick is a different concept from Smart. 
Distinct <--Antonym--> Identical <--RelatedTo--> Copy <--RelatedTo--> Document <--IsA-- Log 
Pregnant <--Synonym--> Significant <--Antonym--> Slight <--Antonym--> Thick <--DistinctFrom--> Smart 