Imagine is a synonym of Regard. Regard is a synonym of Remark. Remark is related to Mention. Remember is a type of Mention. 
Cell is related to Biology. Biology is related to Science. Science is related to Smart. Smart is related to Brilliant. 
Imagine <--Synonym--> Regard <--Synonym--> Remark <--RelatedTo--> Mention <--IsA-- Remember 
Cell <--RelatedTo--> Biology <--RelatedTo--> Science <--RelatedTo--> Smart <--RelatedTo--> Brilliant 