50

11 класс, суффиксы
к каждому слову по 2-3 других

Examination- examinator-examine-examinable

Imagination- imaginative- imaginativeness-imaginary

Consideration- considerable-considerateness-considerately

dictation-dictationship-dictated

collection-collectioner-collected- collecting

direction-director-directness-directorship

co-operation-co operational- co operated-co operating

isolation-isolationist -isolationism-isolating

concentration-concentrating-concentrated -concentrability