dirty thoughts vs thought

dirty thoughts and thought both are nouns.

Word	Noun	Adjective	Verb	Adverb
dirty thoughts	Yes	No	No	No
thought	Yes	No	No	No

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

Other hypernyms of dirty thoughts include cerebration, intellection, mentation, thinking, thought process.

dirty thoughts (noun)	thought (noun)
thoughts about sex or sexual encounters.	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