psalterium vs third stomach

psalterium and third stomach both are nouns.

Word	Noun	Adjective	Verb	Adverb
psalterium	Yes	No	No	No
third stomach	Yes	No	No	No

As nouns, psalterium and third stomach are synonyms defined as:

psalterium and third stomach: the third compartment of the stomach of a ruminant

Other synonyms of psalterium include omasum.

psalterium (noun)	third stomach (noun)
the third compartment of the stomach of a ruminant	the third compartment of the stomach of a ruminant