Get is a synonym of Start. Start is a different concept from Landing. Touchdown is a type of Landing. 
Attack is a type of Knock. Attack is related to Chop. Chop is related to Crop. 
Get <--Synonym--> Start <--DistinctFrom--> Landing <--IsA-- Touchdown 
Knock <--IsA-- Attack <--RelatedTo--> Chop <--RelatedTo--> Crop 