psalm vs sacred writing

psalm and sacred writing both are nouns.

Word	Noun	Adjective	Verb	Adverb
psalm	Yes	No	Yes	No
sacred writing	Yes	No	No	No

As nouns, sacred writing is a hypernym of psalm; that is, sacred writing is a word with a broader meaning than psalm:

Other hypernyms of psalm include religious text, religious writing, sacred text.

psalm (noun)	sacred writing (noun)
any sacred song used to praise the deity	writing that is venerated for the worship of a deity

psalm (verb)	sacred writing (verb)
sing or celebrate in psalms