def listwords():
'''Interface for listWords().'''
t = IOHelper.chooseOption("Enter list type", ["all", "field"])
if t == "field":
fields = Library.getFields()
f = IOHelper.chooseOption("Enter desired field", fields)
options = Library.getFieldOptions(f)
o = IOHelper.chooseOption("Enter option to list", options)
l = Library.listWords(t, f, o)
else:
l = Library.listWords(t)
if len(l) > 0:
outputWordList(l)
else:
print("No words to display")
