detection vs spotting

detection and spotting both are nouns.

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

As nouns, detection and spotting are synonyms defined as:

detection and spotting: the act of detecting something; catching sight of something

Other synonyms of detection include catching, espial, spying.

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