eyehole vs spyhole

eyehole and spyhole both are nouns.

Word	Noun	Adjective	Verb	Adverb
eyehole	Yes	No	No	No
spyhole	Yes	No	No	No

As nouns, eyehole and spyhole are synonyms defined as:

eyehole and spyhole: a hole (in a door or an oven etc) through which you can peep

Other synonyms of eyehole include peephole.

eyehole (noun)	spyhole (noun)
a small hole (usually round and finished around the edges) in cloth or leather for the passage of a cord or hook or bar	a hole (in a door or an oven etc) through which you can peep
a hole (in a door or an oven etc) through which you can peep