Thanksgiving is a synonym of Grace. Grace is related to Prayer. Prayer is related to Religious. Religious is related to Bless. 
Compound is the opposite of Simple. Simple is related to Add. Add is a synonym of Contribute. 
Thanksgiving <--Synonym--> Grace <--RelatedTo--> Prayer <--RelatedTo--> Religious <--RelatedTo--> Bless 
Compound <--Antonym--> Simple <--RelatedTo--> Add <--Synonym--> Contribute 