thoughtful vs musing

thoughtful is not a noun while musing is a noun.

Word	Noun	Adjective	Verb	Adverb
thoughtful	No	Yes	No	No
musing	Yes	Yes	No	No

thoughtful (noun)	musing (noun)
	a calm, lengthy, intent consideration

thoughtful (adjective)	musing (adjective)
exhibiting or characterized by careful thought	deeply or seriously thoughtful
taking heed; giving close and thoughtful attention
considerate of the feelings or well-being of others
having intellectual depth
characterized by solemn, sincere manner