Shuttle is related to Discovery. Discovery is related to Planet. Planet is a different concept from Moon. Moon is related to Star. 
Answer is related to Refuse. Refuse is a different concept from Comply. Comply is a synonym of Follow. 
Shuttle <--RelatedTo--> Discovery <--RelatedTo--> Planet <--DistinctFrom--> Moon <--RelatedTo--> Star 
Answer <--RelatedTo--> Refuse <--DistinctFrom--> Comply <--Synonym--> Follow 