Sound can be used for Communicate. Sound is a type of Valid. 
Play is related to Childhood. Childhood is related to Manner. Manner is related to Good. Good is related to Luck. 
Communicate <--UsedFor-- Sound --IsA--> Valid 
Play <--RelatedTo--> Childhood <--RelatedTo--> Manner <--RelatedTo--> Good <--RelatedTo--> Luck 