Invest is a synonym of Commit. Promise is etymologically related to Commit. Promise is related to Guarantee. 
God is related to Maker. Maker is related to Trouble. Trouble is the opposite of Okay. Okay is related to Response. 
Invest <--Synonym--> Commit <--EtymologicallyRelatedTo-- Promise <--RelatedTo--> Guarantee 
God <--RelatedTo--> Maker <--RelatedTo--> Trouble <--Antonym--> Okay <--RelatedTo--> Response 