arnica vs balm

arnica and balm both are nouns.

Word	Noun	Adjective	Verb	Adverb
arnica	Yes	No	No	No
balm	Yes	No	No	No

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

arnica: an ointment used in treating bruises
balm: semisolid preparation (usually containing a medicine) applied externally as a remedy or for soothing an irritation

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

arnica (noun)	balm (noun)
an ointment used in treating bruises	semisolid preparation (usually containing a medicine) applied externally as a remedy or for soothing an irritation
any of various rhizomatous usually perennial plants of the genus Arnica	any of various aromatic resinous substances used for healing and soothing
used especially in treating bruises