reflection vs mourning

reflection and mourning both are nouns.

Word	Noun	Adjective	Verb	Adverb
reflection	Yes	No	No	No
mourning	Yes	Yes	No	No

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

Other hyponyms of reflection include lamentation, act, blowup, ebullition, effusion, gush, outburst.

reflection (noun)	mourning (noun)
the image of something as reflected by a mirror (or other reflective material)	the passionate and demonstrative activity of expressing grief
the ability to reflect beams or rays	state of sorrow over the death or departure of a loved one
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
(mathematics) a transformation in which the direction of one axis is reversed

reflection (adjective)	mourning (adjective)
	sorrowful through loss or deprivation