tomentum vs capillary vessel

tomentum and capillary vessel both are nouns.

Word	Noun	Adjective	Verb	Adverb
tomentum	Yes	No	No	No
capillary vessel	Yes	No	No	No

As nouns, capillary vessel is a hypernym of tomentum; that is, capillary vessel is a word with a broader meaning than tomentum:

tomentum: a network of tiny blood vessels between the cerebral surface of the pia mater and the cerebral cortex
capillary vessel: any of the minute blood vessels connecting arterioles with venules

Other hypernyms of tomentum include capillary.

tomentum (noun)	capillary vessel (noun)
a network of tiny blood vessels between the cerebral surface of the pia mater and the cerebral cortex	any of the minute blood vessels connecting arterioles with venules
filamentous hairlike growth on a plant