Painful is similar to Sensitive. Sensitive is a synonym of Aware. 
Silence is related to Quiet. Quiet is related to Call. Call is related to Help. Robot can be used for Help. 
Painful <--SimilarTo--> Sensitive <--Synonym--> Aware 
Silence <--RelatedTo--> Quiet <--RelatedTo--> Call <--RelatedTo--> Help <--UsedFor-- Robot 