cogitation vs reflexion

cogitation and reflexion both are nouns.

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

As nouns, reflexion is a hypernym of cogitation; that is, reflexion is a word with a broader meaning than cogitation:

Other hypernyms of cogitation include contemplation, musing, reflection, rumination, thoughtfulness.

cogitation (noun)	reflexion (noun)
attentive consideration and meditation	the image of something as reflected by a mirror (or other reflective material)
a carefully considered thought about something	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