is a specific kind of: fraction.

is a broader term that covers: 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 | one-quintillionth, quintillionth ... show more.