spotting vs espial

spotting and espial both are nouns.

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

As nouns, spotting and espial are synonyms defined as:

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

Other synonyms of spotting include catching, detection, spying.

spotting (noun)	espial (noun)
the act of detecting something; catching sight of something	the act of detecting something; catching sight of something
the act of spotting or staining something