holy oil vs unguent

holy oil and unguent both are nouns.

Word	Noun	Adjective	Verb	Adverb
holy oil	Yes	No	No	No
unguent	Yes	No	No	No

As nouns, unguent is a hypernym of holy oil; that is, unguent is a word with a broader meaning than holy oil:

holy oil: a consecrated ointment consisting of a mixture of oil and balsam
unguent: semisolid preparation (usually containing a medicine) applied externally as a remedy or for soothing an irritation

Other hypernyms of holy oil include balm, ointment, salve, unction.

holy oil (noun)	unguent (noun)
a consecrated ointment consisting of a mixture of oil and balsam	semisolid preparation (usually containing a medicine) applied externally as a remedy or for soothing an irritation