Synonyms for Li (same or very similar meaning)
WordNet sense 1 (a soft silver-white univalent element of the alkali metal group; the lightest metal known; occurs in several minerals):
lithiumWordNet sense 2 (being one more than fifty):
fifty-oneWordNet sense 3 (being or denoting a numerical quantity but not order):
cardinalFrom the ODE community, based on WordNetadd/edit