gistfile1.py

import urllib, urllib2, csv, json

_check_domain = "http://ajaxwhois.com/lookup?d="

count = 0

words = """enter
words
here"""

for word in words.splitlines():
    # build the url
    check_domain = _check_domain
    for tld in ['.com', ]: # add .net, .org if you want
        check_domain += word + tld + ','
    check_domain.rstrip(',')
    
    # get the data
    response = urllib2.urlopen(check_domain).read()
    
    data = json.loads(response)
    
    # check and print if available
    for domain in data['r']:
        print domain['d'] if domain['a'] else ''
    
    count += 1