brooding vs thoughtful

brooding is a noun but thoughtful is not a noun.

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

brooding (noun)	thoughtful (noun)
persistent morbid meditation on a problem
sitting on eggs so as to hatch them by the warmth of the body

brooding (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