Polyptoton

Polyptoton is the stylistic scheme in which words derived from the same root are repeated (such as "strong" and "strength"). A related stylistic device is antanaclasis, in which the same word is repeated, but each time with a different sense. Another related term is figura etymologica.
Other Definition.
In inflected languages polyptoton is the same word being repeated but appearing each time in a different case. (for example, "Iuppiter", "Iovis", "Iovi", "Iovem", "Iove" [in Latin being the nominative, genitive, dative, accusative, and ablative forms of "Iuppiter" (the god Jupiter), respectively]).
Genesis.
The form is relatively common in Latin Christian poetry and prose in a construction called the superlative genitive, in phrases such as sanctum sanctorum ("holy of holies"), and found its way into languages such as Old English, which naturally preferred the prevalent alliteration that is part and parcel of polyptoton—in fact, polyptoton is "much more prevalent in Old English verse than in Latin verse." The specific superlative genitive in Old English, however, occurs only in Latinate Christian poems, not in secular poetry.
Historical instances and usages.
It is also used in public speaking, and several examples can be found in Churchill's speeches. 
G. K. Chesterton frequently employed this device to create paradox: 
In combination with verbal active and passive voices, it points out the idea of a latent reciprocity:
An alternative way to use the device is to develop polyptoton over the course of an entire novel, which is done in Mary Shelley's Frankenstein. Shelley combines polyptoton with periphrastic naming, which is the technique of referring to someone using several indirect names. The creature in Frankenstein is referred to by many terms, such as "fiend", "devil", "being", and "ogre". However, the first term that Shelley uses in reference to the creature is "wretch". Throughout the novel, various forms of this are used, such as "wretchedly" and "wretchedness", which may be seen as polyptoton. According to Duyfhuizen, the gradual development of polyptoton in "Frankenstein" is significant because it symbolizes the intricacies of one's own identity.