There's a new-to-me set of Google Ngrams (big files with frequency counts for common and not-so-common English words&phrases&word-strings): Google Ngrams Download. I mention this because when I do a Web Search for "google ngrams download", the top result was a link to the previous set of data from 2012. Too bad those Google people aren't better at SEO (haha I kid but seriously I'm grateful for these files).