Typical code for typical work. I just forget things so why not use GIST

extract_full_array_from_json.py

import json, sys
from functools import reduce

inputfilename = sys.argv[1]
outputfilename = sys.argv[2]

file = open(inputfilename, mode='r', encoding='utf-8')
raw = file.read()
file.close()
raw_json = json.loads(raw)
results = raw_json["response"]["results"]

words = [a["alternatives"][0]["words"] for a in results]

words_only = reduce(lambda a,b: a+b, words)

file = open(outputfilename, mode='w', encoding='utf-8')
file.write(json.dumps(words_only, ensure_ascii=False, indent=2))
file.close()