concretion vs compression

concretion and compression both are nouns.

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

As nouns, concretion and compression are synonyms defined as:

Other synonyms of concretion include compaction, densification.

concretion (noun)	compression (noun)
the union of diverse things into one body or form or group; the growing together of parts	applying pressure
an increase in the density of something	encoding information while reducing the bandwidth or bits required
a hard lump produced by the concretion of mineral salts; found in hollow organs or ducts of the body	the process or result of becoming smaller or pressed together
the formation of stonelike objects within a body organ (e.g., the kidneys)	an increase in the density of something