There are 2 definitions of peeper in English:

peeper1

Syllabification: peep·er
Pronunciation: /ˈpēpər
 
/

noun

1A person who peeps at someone or something, especially in a voyeuristic way.
More example sentences
  • Say I've written this news lead out of a city council meeting: ‘Should the Seattle police be able to peep at the peepers in the peep shows?’
  • Who wants peepers and peerers standing outside bedrooms, peeping and peering?
  • Ninety-eight percent of peepers and peerers did not go on to commit a violent or sexual offence.
1.1 (peepers) informal A person’s eyes: keep your peepers peeled for a familiar face
More example sentences
  • Test your peepers: eyes can offer clues to conditions such as diabetes and high blood pressure.
  • After the extensive tour I thought it would be rude not to take up the kind offer of an eye test, and I am happy to report my peepers are in good nick.
  • For one thing, those entering the theatre with a Christian sensibility operating behind the peepers will no doubt see something different from those from a secular perspective.

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Word of the day setose
Pronunciation: ˈsēˌtōs
adjective
bearing bristles or setae; bristly

There are 2 definitions of peeper in English:

peeper2

Syllabification: peep·er
Pronunciation: /
 
ˈpēpər/
(also spring peeper)

noun

A small North American tree frog that has brownish-gray skin with a dark cross on the back, the males of which sing in early spring.
  • Hyla crucifer, family Hylidae
More example sentences
  • Listen to calls of the frogs around you, or sample frog calls on the web: the spring peeper and the common toad.
  • Species seen included black rat snake, ribbon snake, milk snake, gray tree frog, green frog, pickerel frog, wood frog, spring peeper, mountain dusky salamander, and the rare and beautiful long-tailed salamander.
  • These pools as well as the deeper water areas of the sedge meadow provide breeding habitat for chorus frogs, spring peepers, and smallmouth salamanders.

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Word of the day setose
Pronunciation: ˈsēˌtōs
adjective
bearing bristles or setae; bristly