Spokesman is etymologically related to Speak. Speak requires Think. Plan is a type of Think. Planner is derived from Plan. 
Burst is a type of Activity. Activity is related to Work. Work is related to Engineer. 
Spokesman --EtymologicallyRelatedTo--> Speak --HasPrerequisite--> Think <--IsA-- Plan <--DerivedFrom-- Planner 
Burst --IsA--> Activity <--RelatedTo--> Work <--RelatedTo--> Engineer 