tomentum vs tomentum cerebri

tomentum and tomentum cerebri both are nouns.

Word	Noun	Adjective	Verb	Adverb
tomentum	Yes	No	No	No
tomentum cerebri	Yes	No	No	No

As nouns, tomentum and tomentum cerebri are synonyms defined as:

tomentum and tomentum cerebri: a network of tiny blood vessels between the cerebral surface of the pia mater and the cerebral cortex

tomentum (noun)	tomentum cerebri (noun)
a network of tiny blood vessels between the cerebral surface of the pia mater and the cerebral cortex	a network of tiny blood vessels between the cerebral surface of the pia mater and the cerebral cortex
filamentous hairlike growth on a plant