Rumor is a synonym of Talk. Talk is a synonym of Debate. Debate is a synonym of Discourse. 
Trial is related to Review. Review is related to Scan. Beam can be used for Scan. 
Rumor <--Synonym--> Talk <--Synonym--> Debate <--Synonym--> Discourse 
Trial <--RelatedTo--> Review <--RelatedTo--> Scan <--UsedFor-- Beam 