heed vs thoughtful

heed is a noun but thoughtful is not a noun.

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

heed (noun)	thoughtful (noun)
paying particular notice (as to children or helpless people)

heed (adjective)	thoughtful (adjective)
	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

heed (verb)	thoughtful (verb)
pay close attention to; give heed to