musing vs thoughtful

musing is a noun but thoughtful is not a noun.

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

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

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