third stomach vs psalterium

third stomach and psalterium both are nouns.

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

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

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

Other synonyms of third stomach include omasum.

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