thought vs whimsy

thought and whimsy both are nouns.

Word	Noun	Adjective	Verb	Adverb
thought	Yes	No	No	No
whimsy	Yes	No	No	No

As nouns, whimsy is a hyponym of thought; that is, whimsy is a word with a more specific, narrower meaning than thought:

thought (noun)	whimsy (noun)
the process of using your mind to consider something carefully	the trait of acting unpredictably and more from whim or caprice than from reason or judgment
the content of cognition; the main thing you are thinking about	an odd or fanciful or capricious idea
the organized beliefs of a period or group or individual
a personal belief or judgment that is not founded on proof or certainty