musing vs reflexion

musing and reflexion both are nouns.

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

As nouns, musing and reflexion are synonyms defined as:

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

musing (noun)	reflexion (noun)
a calm, lengthy, intent consideration	the image of something as reflected by a mirror (or other reflective material)
	the ability to reflect beams or rays
	a likeness in which left and right are reversed
	a calm, lengthy, intent consideration
	a remark expressing careful consideration
	expression without words
	the phenomenon of a propagating wave (light or sound) being thrown back from a surface

musing (adjective)	reflexion (adjective)
deeply or seriously thoughtful