Declare is related to Tell. Toll is etymologically related to Tell. Toll is etymologically related to Tale. 
Adult is etymologically related to Adolescent. Adult is a different concept from Youth. 
Declare <--RelatedTo--> Tell <--EtymologicallyRelatedTo-- Toll --EtymologicallyRelatedTo--> Tale 
Adolescent <--EtymologicallyRelatedTo-- Adult <--DistinctFrom--> Youth 