capillary vessel vs capillary

capillary vessel and capillary both are nouns.

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

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

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

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

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