Pursuit is related to Game. Game is a synonym of Willing. Willing is related to Voluntary. 
Convenience is a type of Comfort. Comfort is a synonym of Ease. Ease is a different concept from Hard. Hard is related to Difficulty. 
Pursuit <--RelatedTo--> Game <--Synonym--> Willing <--RelatedTo--> Voluntary 
Convenience --IsA--> Comfort <--Synonym--> Ease <--DistinctFrom--> Hard <--RelatedTo--> Difficulty 