def word_literals(self):
        """The list of literals per word in ``words`` layer."""
        literals = []
        for word_synsets in self.synsets:
            word_literals = set()
            for synset in word_synsets:
                for variant in synset.get(SYN_VARIANTS):
                    if LITERAL in variant:
                        word_literals.add(variant[LITERAL])
            literals.append(list(sorted(word_literals)))
        return literals
The list of literals per word in ``words`` layer.