whimsey vs thought

whimsey and thought both are nouns.

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

As nouns, thought is a hypernym of whimsey; that is, thought is a word with a broader meaning than whimsey:

Other hypernyms of whimsey include idea.

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