concretion vs concentration

concretion and concentration both are nouns.

Word	Noun	Adjective	Verb	Adverb
concretion	Yes	No	No	No
concentration	Yes	No	No	No

As nouns, concentration is a hypernym of concretion; that is, concentration is a word with a broader meaning than concretion:

concretion (noun)	concentration (noun)
the union of diverse things into one body or form or group; the growing together of parts	strengthening the concentration (as of a solute in a mixture) by removing diluting material
an increase in the density of something	bringing together military forces
a hard lump produced by the concretion of mineral salts; found in hollow organs or ducts of the body	great and constant diligence and attention
the formation of stonelike objects within a body organ (e.g., the kidneys)	the strength of a solution; number of molecules of a substance in a given volume
	the spatial property of being crowded together
	complete attention; intense mental effort
	increase in density