Equality is related to Being. Being is related to Existence. Existence is a synonym of Universe. you are likely to find Light in/at/on Universe. 
Engagement is related to Married. Married is a different concept from Widow. Widow is related to Survivor. 
Equality <--RelatedTo--> Being <--RelatedTo--> Existence <--Synonym--> Universe <--AtLocation-- Light 
Engagement <--RelatedTo--> Married <--DistinctFrom--> Widow <--RelatedTo--> Survivor 