rumen

As a noun caecum is

(anatomy) a blind pouch connected to the large intestine between the ileum and the colon.

As an adjective liver

is (label) from or pertaining to liverpool.

As a noun craw

is (archaic) the stomach of an animal.

As a verb craw

is (archaic) to caw, crow, for certain birds to make their cry.

As a noun crop

is a plant, especially a cereal, grown to be harvested as food, livestock fodder or fuel or for any other economic purpose.

As a verb crop

is to remove the top end of something, especially a plant.

As a noun rumen

is the first compartment of the stomach of a cow or other ruminants.

As an adjective monogastric is

having a simple single-chambered stomach.

As a noun reticulum is

reticulum.

As a noun cecum is

.

As nouns the difference between rumen and abomasum

is that rumen is the first compartment of the stomach of a cow or other ruminants while abomasum is the fourth or digestive compartment of the stomach of a cow or other ruminant, after the omasum.

As a verb regurgitate is

to throw up or vomit; to eject what has previously been swallowed.