signal/noise ratio vs signal/noise

signal/noise ratio and signal/noise both are nouns.

Word	Noun	Adjective	Verb	Adverb
signal/noise ratio	Yes	No	No	No
signal/noise	Yes	No	No	No

As nouns, signal/noise ratio and signal/noise are synonyms defined as:

signal/noise ratio and signal/noise: the ratio of signal intensity to noise intensity

Other synonyms of signal/noise ratio include S/N, signal-to-noise, signal-to-noise ratio.

signal/noise ratio (noun)	signal/noise (noun)
the ratio of signal intensity to noise intensity	the ratio of signal intensity to noise intensity