Career is related to Profession. Profession is a type of Occupation. Occupation is related to Builder. Builder is a type of Material. 
Poem can be used for Writing. Writing is related to Form. Formal is etymologically related to Form. Formal is related to Speech. 
Career <--RelatedTo--> Profession --IsA--> Occupation <--RelatedTo--> Builder --IsA--> Material 
Poem --UsedFor--> Writing <--RelatedTo--> Form <--EtymologicallyRelatedTo-- Formal <--RelatedTo--> Speech 