thought vs substance

thought and substance both are nouns.

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

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

thought (noun)	substance (noun)
the process of using your mind to consider something carefully	the real physical matter of which a person or thing consists
the content of cognition; the main thing you are thinking about	a particular kind or species of matter with uniform properties
the organized beliefs of a period or group or individual	the property of holding together and retaining its shape
a personal belief or judgment that is not founded on proof or certainty	the idea that is intended
	the choicest or most essential or most vital part of some idea or experience
	content communicating a message; what something is about
	considerable capital (wealth or income)
	material of a particular kind or constitution