mercurial ointment vs unction

mercurial ointment and unction both are nouns.

Word	Noun	Adjective	Verb	Adverb
mercurial ointment	Yes	No	No	No
unction	Yes	No	No	No

As nouns, unction is a hypernym of mercurial ointment; that is, unction is a word with a broader meaning than mercurial ointment:

mercurial ointment: an ointment containing mercury
unction: semisolid preparation (usually containing a medicine) applied externally as a remedy or for soothing an irritation

Other hypernyms of mercurial ointment include balm, ointment, salve, unguent.

mercurial ointment (noun)	unction (noun)
an ointment containing mercury	anointing as part of a religious ceremony or healing ritual
	semisolid preparation (usually containing a medicine) applied externally as a remedy or for soothing an irritation
	smug self-serving earnestness
	excessive but superficial compliments given with affected charm