To glimpse is defined as to catch a quick look at something.
To be the victim of (something unpleasant, painful etc.). [from 13th c.]
To catch sight of (something difficult to discern).
To catch or discover, as in a misdeed
Spot is defined as to stain, to remove stains, to recognize or to see.
To catch sight of; make out; perceive; see
To discover is defined as to learn something new, become aware of something or to find something, especially if you are the first to locate it.
To notice or perceive (something)
To get sight of (something).
To survey or study mentally; consider:
To attend to dangers to or regarding.
To have the power to perceive with the eyes:
Find another word for espy. In this page you can discover 18 synonyms, antonyms, idiomatic expressions, and related words for espy, like: glimpse, catch, descry, detect, discern, spot, spy, see, discover, find and notice.