different between whimsy vs eccentricity

English

Probably from whims +? -y. Related to whim-wham, whim.

whimsy (usually uncountable, plural whimsies)

A quaint and fanciful idea; a whim; playfully odd behaviour.
An impulsive, illogical or capricious character.
(mining) A whim (capstan or vertical drum).
A jigsaw puzzle piece that has been cut into a recognizable shape, as if on a whim; often the shape is representative of the theme of the image used for the puzzle.

whimsy (third-person singular simple present whimsies, present participle whimsying, simple past and past participle whimsied)

eccentric +? -ity

eccentricity (countable and uncountable, plural eccentricities)

The quality of being eccentric or odd; any eccentric behaviour.
(mathematics) The ratio, constant for any particular conic section, of the distance of a point from the focus to its distance from the directrix.
(astronomy) The eccentricity of the conic section (usually an ellipse) defined by the orbit of a given object around a reference object (such as that of a planet around the sun).

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