reflexion vs cogitation

reflexion and cogitation both are nouns.

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

As nouns, cogitation is a hyponym of reflexion; that is, cogitation is a word with a more specific, narrower meaning than reflexion:

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