Marriage is related to Engagement. Engagement is related to Marry. Marry is related to Propose. Propose is related to Will. 
Peace is a type of Harmony. Peace is related to Silence. Silence is related to Complete. Complete is the opposite of Start. 
Marriage <--RelatedTo--> Engagement <--RelatedTo--> Marry <--RelatedTo--> Propose <--RelatedTo--> Will 
Harmony <--IsA-- Peace <--RelatedTo--> Silence <--RelatedTo--> Complete <--Antonym--> Start 