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.
source_dicts
the dictionaries to use; options are any permutation of
"ahd", "century", "wiktionary", "wordnet" and "webster". "all" (the default)
searches all of them.
pronunciation_type
the type of pronunciations to return, if available;
options are "ahd", "IPA", "arpabet" and "gcide-diacritical". "all" (the
default) provides any that are available.
limit
the maximum number of items to return for any one word.