Synonyms for Zero (same or very similar meaning)
WordNet sense 1 (a mathematical element that when added to another number yields the same number):
cipher, nought, cypher
WordNet sense 2 (a quantity of no importance):
aught, naught, nil, nix, nothing, null, zilch, zip, nada, goose egg, zippo
WordNet sense 3 (the quantity that registers a reading of zero on a scale):
zero point
WordNet sense 4 (quantifier; used with either mass nouns or plural count nouns for indicating a complete or almost complete lack or zero quantity of):
no
WordNet sense 5 (being or denoting a numerical order in a series):
ordinal
WordNet sense 6 (being or denoting a numerical quantity but not order):
cardinal
WordNet sense 7 (adjust (as by firing under test conditions) the zero of (a gun)):
zero in
From the ODE community, based on WordNet
add/edit