Assumption is related to Hypothesis. Hypothesis is a type of Concept. Concept is a synonym of Conception. 
Elderly is a synonym of Senior. Senior is related to Executive. Executive is related to Employee. 
Assumption <--RelatedTo--> Hypothesis --IsA--> Concept <--Synonym--> Conception 
Elderly <--Synonym--> Senior <--RelatedTo--> Executive <--RelatedTo--> Employee 