zinc ointment vs balm

zinc ointment and balm both are nouns.

Word	Noun	Adjective	Verb	Adverb
zinc ointment	Yes	No	No	No
balm	Yes	No	No	No

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

zinc ointment: an ointment containing zinc that is used to treat certain skin diseases
balm: semisolid preparation (usually containing a medicine) applied externally as a remedy or for soothing an irritation

Other hypernyms of zinc ointment include ointment, salve, unction, unguent.

zinc ointment (noun)	balm (noun)
an ointment containing zinc that is used to treat certain skin diseases	semisolid preparation (usually containing a medicine) applied externally as a remedy or for soothing an irritation
	any of various aromatic resinous substances used for healing and soothing