capillary vs capillary vessel

capillary and capillary vessel both are nouns.

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

As nouns, capillary and capillary vessel are synonyms defined as:

capillary and capillary vessel: any of the minute blood vessels connecting arterioles with venules

capillary (noun)	capillary vessel (noun)
a tube of small internal diameter; holds liquid by capillary action	any of the minute blood vessels connecting arterioles with venules
any of the minute blood vessels connecting arterioles with venules

capillary (adjective)	capillary vessel (adjective)
of or relating to hair
long and slender with a very small internal diameter