Thin is related to Tower. Tower is related to Observation. 
Cry is etymologically related to Greet. Greet is a synonym of Recognize. Recognize is related to Acknowledge. 
Thin <--RelatedTo--> Tower <--RelatedTo--> Observation 
Cry --EtymologicallyRelatedTo--> Greet <--Synonym--> Recognize <--RelatedTo--> Acknowledge 