Donation is related to Give. Give is the opposite of Need. Need is related to Requirement. Requirement is a synonym of Must. 
Invitation is related to Accept. Accept is a synonym of Value. Value is related to Equity. Equity is related to House. 
Donation <--RelatedTo--> Give <--Antonym--> Need <--RelatedTo--> Requirement <--Synonym--> Must 
Invitation <--RelatedTo--> Accept <--Synonym--> Value <--RelatedTo--> Equity <--RelatedTo--> House 