There are many ways to learn English Word Power as under:
1) Etymological derivation of words: Many English words have got their origin from Greek or Latin root. From one root of either Greek or Latin, many English words have their origin. Thus, remembering one root of Greek or Latin, we can remember multiple of English words.
2) Origin of Words from other languages: English is melting point of many languages. During colonial rule English has assimilated many local languages into it. For e.g: many words of hindi, Sanskrit etc local languages are taken into English. Thus, learning the origin of the words, we can easily remember the word.
3) Phonetic similarity method of word power remembering: By this method, phonetic assimilation of English words is done with your local language to make it easy to remember that word.
4) Other methods: Few other methods we adopt to let the student avoid mugging English words and let them remember the word with its exact meaning.