Expand is the opposite of Contract. Contract is related to Document. Document is related to Pass. Pass is a synonym of Happen. 
Park is related to Space. Space is related to Button. Button is related to Plastic. 
Expand <--Antonym--> Contract <--RelatedTo--> Document <--RelatedTo--> Pass <--Synonym--> Happen 
Park <--RelatedTo--> Space <--RelatedTo--> Button <--RelatedTo--> Plastic 