Excuse is a synonym of Explain. Explain is related to Help. Help is related to Offering. 
Undergo is a synonym of Pass. Pass is part of Range. Range is related to Electric. Electric is related to Power. 
Excuse <--Synonym--> Explain <--RelatedTo--> Help <--RelatedTo--> Offering 
Undergo <--Synonym--> Pass --PartOf--> Range <--RelatedTo--> Electric <--RelatedTo--> Power 