Rumen and Tum

Rumen noun - The first compartment of the stomach of a ruminant; here food is collected and returned to the mouth as cud for chewing.

Tum and rumen are semantically related. In some cases you can use "Tum" instead a noun "Rumen".

Tum noun - An enlarged and muscular saclike organ of the alimentary canal; the principal organ of digestion.

Rumen and tum are semantically related. Sometimes you can replace term "Rumen" with "Tum", this nouns are similar.