Discover is a synonym of Invent. Invent is related to Design. Design is related to Architect. Architect is a type of Designer. 
Tone is related to Voice. Voice is related to Talk. 
Discover <--Synonym--> Invent <--RelatedTo--> Design <--RelatedTo--> Architect --IsA--> Designer 
Tone <--RelatedTo--> Voice <--RelatedTo--> Talk 