signal detection vs detection

signal detection and detection both are nouns.

Word	Noun	Adjective	Verb	Adverb
signal detection	Yes	No	No	No
detection	Yes	No	No	No

As nouns, signal detection and detection are synonyms defined as:

signal detection and detection: the detection that a signal is being received

signal detection (noun)	detection (noun)
the detection that a signal is being received	the act of detecting something; catching sight of something
	a police investigation to determine the perpetrator
	the perception that something has occurred or some state exists
	the detection that a signal is being received