simple fraction vs one-quintillionth

Other hyponyms of simple fraction include half, one-half, one-third, third, tierce, two-thirds, fourth, fourth part, one-fourth, one-quarter, quarter, quartern, twenty-five percent, three-fourths, three-quarters, fifth, fifth part, one-fifth, twenty percent, one-sixth, sixth, one-seventh, seventh, eighth, one-eighth, ninth, one-ninth, one-tenth, ten percent, tenth, tenth part, duodecimal, one-twelfth, twelfth, twelfth part, one-sixteenth, sixteenth, sixteenth part, one-thirty-second, thirty-second, thirty-second part, one-sixtieth, sixtieth, one-sixty-fourth, sixty-fourth, hundredth, one-hundredth, one percent, one-thousandth, thousandth, one-ten-thousandth, ten-thousandth, one-hundred-thousandth, millionth, one-millionth, one-hundred-millionth, billionth, one-billionth, one-trillionth, trillionth, one-quadrillionth, quadrillionth, quintillionth.