spectrum

As nouns the difference between spectrum and gradient

is that spectrum is specter, apparition while gradient is gradient.

As a noun spectrum

is specter, apparition.

As an adjective undefined is

lacking a definition or value.

As nouns the difference between schema and spectrum

is that schema is schema, diagram while spectrum is specter, apparition.

As nouns the difference between spectrum and gradation

is that spectrum is specter, apparition while gradation is a sequence of gradual, successive stages; a systematic progression.

As a verb gradation is

to form with gradations.

As a noun spectrum

is specter, apparition.

As a proper noun black is

.

As nouns the difference between ambit and spectrum

is that ambit is the sphere or area of control and influence of something while spectrum is specter, apparition.

As nouns the difference between instrument and spectrum

is that instrument is a device used to produce music while spectrum is specter, apparition.

As a verb instrument

is to apply measuring devices.

As nouns the difference between periodogram and spectrum

is that periodogram is a graph used in the harmonic analysis of spectra, time series etc while spectrum is specter, apparition.

As nouns the difference between spectrum and aspect

is that spectrum is specter, apparition while aspect is the way something appears when viewed from a certain direction or perspective.