effusion vs reflexion

effusion and reflexion both are nouns.

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

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

Other hypernyms of effusion include expression, manifestation, reflection.

effusion (noun)	reflexion (noun)
flow under pressure	the image of something as reflected by a mirror (or other reflective material)
an unrestrained expression of emotion	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