achylia gastrica vs achylia

achylia gastrica and achylia both are nouns.

Word	Noun	Adjective	Verb	Adverb
achylia gastrica	Yes	No	No	No
achylia	Yes	No	No	No

As nouns, achylia gastrica and achylia are synonyms defined as:

achylia gastrica and achylia: absence of gastric juices (partial or complete)

achylia gastrica (noun)	achylia (noun)
absence of gastric juices (partial or complete)	absence of gastric juices (partial or complete)