horse balsam vs balm

horse balsam and balm both are nouns.

Word	Noun	Adjective	Verb	Adverb
horse balsam	Yes	No	No	No
balm	Yes	No	No	No

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

horse balsam: an ointment containing horse chestnut extract, used to relieve muscle pain and joint pain.
balm: semisolid preparation (usually containing a medicine) applied externally as a remedy or for soothing an irritation

Other hypernyms of horse balsam include ointment, salve, unction, unguent.

horse balsam (noun)	balm (noun)
an ointment containing horse chestnut extract, used to relieve muscle pain and joint pain.	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