Harvest is related to Growth. Growth is related to Age. Age is related to Elder. 
Rough is a type of Sensation. Sound is a type of Sensation. Sound is related to Tone. Tone is related to Voice. 
Harvest <--RelatedTo--> Growth <--RelatedTo--> Age <--RelatedTo--> Elder 
Rough --IsA--> Sensation <--IsA-- Sound <--RelatedTo--> Tone <--RelatedTo--> Voice 