conditioner vs softener

conditioner and softener both are nouns.

Word	Noun	Adjective	Verb	Adverb
conditioner	Yes	No	No	No
softener	Yes	No	No	No

As nouns, softener is a hypernym of conditioner; that is, softener is a word with a broader meaning than conditioner:

conditioner: a substance used in washing (clothing or hair) to make things softer
softener: a substance added to another to make it less hard

conditioner (noun)	softener (noun)
exercise that conditions the body	a substance added to another to make it less hard
a substance used in washing (clothing or hair) to make things softer
a trainer of athletes