stopwords() function to return character vectors of
stopwords for different languages, using the ISO-639-1 language codes,
and allows for different sources of stopwords to be defined.
The Snowball stopword lists sources for multiple languages. Most of these have been ported from the quanteda stopword lists (in versions <1.0 of that package).
The collection taken from https://github.com/stopwords-iso/stopwords-iso/.
The English-language stopword list from the SMART information retrieval system.
A few additional stopword lists, including the non-Snowball word lists from quanteda versions < 1.0.