reflexion vs retrospect

reflexion and retrospect both are nouns.

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

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

reflexion (noun)	retrospect (noun)
the image of something as reflected by a mirror (or other reflective material)	contemplation of things past
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

reflexion (verb)	retrospect (verb)
	look back upon (a period of time, sequence of events); remember