contemplation vs thoughtfulness

contemplation and thoughtfulness both are nouns.

Word	Noun	Adjective	Verb	Adverb
contemplation	Yes	No	No	No
thoughtfulness	Yes	No	No	No

As nouns, contemplation and thoughtfulness are synonyms defined as:

Other synonyms of contemplation include musing, reflection, reflexion, rumination.

contemplation (noun)	thoughtfulness (noun)
a long and thoughtful observation	a considerate and thoughtful act
a calm, lengthy, intent consideration	the trait of thinking carefully before acting
	kind and considerate regard for others
	a calm, lengthy, intent consideration