Piggle vs. Niggle: What's the Difference?

Piggle and Niggle Definitions
Piggle
(rare) A long-handled fork for mixing or digging.
Niggle
To cause one to be persistently preoccupied, annoyed, or uncomfortable
Doubts niggled at the back of my mind.
Piggle
(transitive) To dig or uproot; to scrape.
Niggle
To pester someone or be annoying or uncomfortable in a persistent way
He niggled at me all day to lend him my car.
Piggle
(intransitive) To toy or fiddle.
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Niggle
To be overly concerned or argumentative, especially about something petty; fuss
Niggled over contract details.
Piggle
To cause to worry, to make uncomfortable; niggle.
Niggle
To preoccupy, annoy, make uncomfortable in a persistent way
Suspicions niggled him.
Piggle
To worry about minor points.
Niggle
To pester or nag (someone).
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Niggle
A minor complaint or problem.
Niggle
(obsolete) Small, cramped handwriting.
Niggle
To trifle with; to deceive; to mock.
Niggle
(transitive) To use, spend, or do in a petty or trifling manner.
Niggle
(intransitive) To dwell too much on minor points or on trifling details.
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Niggle
To fidget, fiddle, be restless.
Niggle
To trifle with; to deceive; to mock.
Niggle
To trifle or play.
Take heed, daughter,You niggle not with your conscience and religion.
Niggle
To act or walk mincingly.
Niggle
To fret and snarl about trifles.
Niggle
To move about restlessly or without result; to fidget.
Niggle
To be finicky or excessively critical; to potter; esp., to work with excessive care for trifling details, as in painting.
Niggle
To use, spend, or do in a petty or trifling manner.
Niggle
To elaborate excessively, as in art.
Niggle
Worry unnecessarily or excessively;
Don't fuss too much over the grandchildren--they are quite big now
Niggle
Argue over petty things;
Let's not quibble over pennies