humber — an estuary of the Ouse and Trent rivers in E England. 37 miles (60 km) long.
lumber — timber sawed or split into planks, boards, etc.
number — one of a series of things distinguished by or marked with numerals.
slumber — to sleep, especially lightly; doze; drowse.
Three-syllable rhymes
call number — the number given to a book in a library, indicating its shelf location
mach number — a number indicating the ratio of the speed of an object to the speed of sound in the medium through which the object is moving. Abbreviation: M.
mass number — the integer nearest in value to the atomic weight of an atom and equal to the number of nucleons in the nucleus of the atom. Symbol: A.
prime number — a positive integer that is not divisible without remainder by any integer except itself and 1, with 1 often excluded: The integers 2, 3, 5, and 7 are prime numbers.
real number — a rational number or the limit of a sequence of rational numbers, as opposed to a complex number.
wave number — the number of waves in one centimeter of light in a given wavelength; the reciprocal of the wavelength.
whole number — Also called counting number. one of the positive integers or zero; any of the numbers (0, 1, 2, 3, …).
Four-or-more syllable rhymes
complex number — any number of the form a + ib, where a and b are real numbers and i = √–1
compound number — a quantity expressed in two or more different but related units
index number — a quantity whose variation over a period of time measures the change in some phenomenon.
magic number — the atomic number or neutron number of an exceptionally stable nuclide.
octane number — (of gasoline) a designation of antiknock quality, numerically equal to the percentage of isooctane by volume in a mixture of isooctane and normal heptane that matches the given gasoline in antiknock characteristics.
Four-or-more syllable rhymes
algebraic number — any number that is a root of a polynomial equation having rational coefficients such as √2 but not π
atomic number — the number of protons in the nucleus of an atom of an element
cardinal number — A cardinal number is a number such as 1, 3, or 10 that tells you how many things there are in a group but not what order they are in. Compare ordinal number.
