gastric mill vs ventriculus

gastric mill and ventriculus both are nouns.

Word	Noun	Adjective	Verb	Adverb
gastric mill	Yes	No	No	No
ventriculus	Yes	No	No	No

As nouns, gastric mill and ventriculus are synonyms defined as:

gastric mill and ventriculus: thick-walled muscular pouch below the crop in many birds and reptiles for grinding food

Other synonyms of gastric mill include gizzard.

gastric mill (noun)	ventriculus (noun)
thick-walled muscular pouch below the crop in many birds and reptiles for grinding food	thick-walled muscular pouch below the crop in many birds and reptiles for grinding food