The document discusses different methods of word formation in the English language including derivation, back-formation, compounding, blending, clipping, acronyms, and conversion. Derivation involves adding prefixes or suffixes to existing words to create new words, while back-formation removes affixes. Compounding joins two existing words together, and blending merges parts of two words. Clipping takes part of a word to form a new, related word. Acronyms use the initial letters of words or phrases. Conversion changes the word class of a word without changing the spelling or form.