Group is related to Gather. Gather is related to People. People is related to Cast. Cast is a synonym of Roll. 
Embrace is a synonym of Cover. Discourse is a type of Cover. 
Group <--RelatedTo--> Gather <--RelatedTo--> People <--RelatedTo--> Cast <--Synonym--> Roll 
Embrace <--Synonym--> Cover <--IsA-- Discourse 