word_bigrams grabs bigrams for whatever words you want
out of the wordnik database, along with the match strength (weighted
with and without factoring in word length).
whether to use the stemmed, canonical form of the word
(i.e. 'cat', for 'cats') instead of the actual word. FALSE by default.
Note that for pronunciations specifically, setting it to TRUE may get a wider
range of pronunciations; you should experiment.
min_wlmi
the minimum (word-length weighted) strength of the similarity
between the bigram words.
limit
the maximum number of items to return for any one word.
...
further arguments to pass to httr's GET.
Value
a data.frame of 5 columns; word, first_gram,
second_gram, mi (the strength of the relationship) and
wlmi (the strength of the relationship, weighted by word length).