concept vs thought

concept and thought both are nouns.

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

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

concept: an abstract or general idea inferred or derived from specific instances
thought: the content of cognition; the main thing you are thinking about

Other hypernyms of concept include idea.

concept (noun)	thought (noun)
an abstract or general idea inferred or derived from specific instances	the process of using your mind to consider something carefully
	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