problem solving vs thought

problem solving and thought both are nouns.

Word	Noun	Adjective	Verb	Adverb
problem solving	Yes	No	No	No
thought	Yes	No	No	No

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

Other hypernyms of problem solving include cerebration, intellection, mentation, thinking, thought process.

problem solving (noun)	thought (noun)
the thought processes involved in solving a problem	the process of using your mind to consider something carefully
the area of cognitive psychology that studies the processes involved in solving problems	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