reflexion vs blowup

reflexion and blowup both are nouns.

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

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

Other hyponyms of reflexion include lamentation, mourning, act, ebullition, effusion, gush, outburst.

reflexion (noun)	blowup (noun)
the image of something as reflected by a mirror (or other reflective material)	a photographic print that has been enlarged
the ability to reflect beams or rays	an unrestrained expression of emotion
a likeness in which left and right are reversed	a violent release of energy caused by a chemical or nuclear reaction
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