thoughtfulness vs contemplation

thoughtfulness and contemplation both are nouns.

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

As nouns, thoughtfulness and contemplation are synonyms defined as:

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

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