Core is related to Planet. Planet is related to Earth. Earth is related to Big. 
Widow is related to Woman. Woman is related to Dress. Dress is a synonym of Costume. 
Core <--RelatedTo--> Planet <--RelatedTo--> Earth <--RelatedTo--> Big 
Widow <--RelatedTo--> Woman <--RelatedTo--> Dress <--Synonym--> Costume 