sacred vs hallowed

sacred and hallowed both are adjectives.

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

As adjectives, sacred and hallowed are synonyms defined as:

sacred (adjective)	hallowed (adjective)
concerned with religion or religious purposes	worthy of religious veneration
(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