Do is related to Could. Could is related to Cloud. Cloud is related to Fog. 
Retired is a form of Retire. Retire is a type of Fire. Fire is a different concept from Water. Water is a type of Element. 
Do <--RelatedTo--> Could <--RelatedTo--> Cloud <--RelatedTo--> Fog 
Retired --FormOf--> Retire --IsA--> Fire <--DistinctFrom--> Water --IsA--> Element 