sacred vs holy

sacred is not a noun while holy is a noun.

Word	Noun	Adjective	Verb	Adverb
sacred	No	Yes	No	No
holy	Yes	Yes	No	No

sacred (noun)	holy (noun)
	a sacred place of pilgrimage

sacred (adjective)	holy (adjective)
concerned with religion or religious purposes	belonging to or derived from or associated with a divine power
(often followed by `to') devoted exclusively to a single use or purpose or person
made or declared or believed to be holy; devoted to a deity or some religious ceremony or use
worthy of respect or dedication
worthy of religious veneration