Holy Writ vs sacred text

Holy Writ and sacred text both are nouns.

Word	Noun	Adjective	Verb	Adverb
Holy Writ	Yes	No	No	No
sacred text	Yes	No	No	No

As nouns, sacred text is a hypernym of Holy Writ; that is, sacred text is a word with a broader meaning than Holy Writ:

Other hypernyms of Holy Writ include religious text, religious writing, sacred writing.

Holy Writ (noun)	sacred text (noun)
the sacred writings of the Christian religions	writing that is venerated for the worship of a deity