The difference between Bug and Pester
When used as nouns, bug means any insect, arachnid, myriapod or entognath, whereas pester means a bother or nuisance.
When used as verbs, bug means to annoy, whereas pester means to bother, harass, or annoy persistently.
check bellow for the other definitions of Bug and Pester
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Bug as a noun (colloquial, US):
Any insect, arachnid, myriapod or entognath.
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Bug as a noun (entomology):
An insect of the order Hemiptera (the "true bugs").
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Bug as a noun (colloquial):
Any insect, arachnid, or other terrestrial arthropod that is a pest.
Examples:
"These flies are a bother. I’ll get some bug spray and kill them."
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Bug as a noun:
Any of various species of marine or freshwater crustaceans; e.g. a Morton Bay bug, mudbug.
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Bug as a noun (chiefly, computing):
A problem that needs fixing.
Examples:
"synonyms: defect glitch"
"The software bug led the computer to calculate 2 plus 2 as 5."
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Bug as a noun:
A contagious illness; a bacterium or virus causing it
Examples:
"He’s got the flu bug."
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Bug as a noun (informal):
An enthusiasm for something; an obsession
Examples:
"I think he’s a gold bug: he has over 10,000 ounces in storage."
"I caught the skiing bug while staying in the Alps."
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Bug as a noun (informal):
A keen enthusiast or hobbyist.
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Bug as a noun:
A concealed electronic eavesdropping or intercept device
Examples:
"We installed a bug in her telephone."
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Bug as a noun:
A small and and usually invisible file (traditionally a single-pixel image) on a World Wide Web page, primarily used to track users.
Examples:
"He suspected the image was a Web bug used for determining who was visiting the site."
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Bug as a noun (broadcasting):
A small, usually transparent or translucent image placed in a corner of a television program to indicate what network or cable channel is televising it
Examples:
"Channel 4's bug distracted Jim from his favorite show."
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Bug as a noun (aviation):
A manually positioned marker in flight instruments.
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Bug as a noun:
A semi-automated telegraph key.
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Bug as a noun (obsolete):
Hobgoblin, scarecrow; anything that terrifies.
Examples:
"synonyms: bog bogey bogle boggle boggard bugbear"
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Bug as a noun (chiefly, LGBT, "the bug"):
HIV.
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Bug as a noun (poker):
A limited form of wild card in some variants of poker.
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Bug as a noun (paleontology, slang):
A trilobite.
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Bug as a noun (petroleum industry, slang, dated):
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Bug as a noun (slang, horse-racing):
A young apprentice jockey.
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Bug as a verb (informal, transitive):
To annoy.
Examples:
"Don’t bug me, I’m busy!"
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Bug as a verb (transitive):
To install an electronic listening device or devices in.
Examples:
"We need to know what’s going on. We’ll bug his house."
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Pester as a verb (transitive):
To bother, harass, or annoy persistently.
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Pester as a noun:
A bother or nuisance.