bath salts vs toiletry

bath salts and toiletry both are nouns.

Word	Noun	Adjective	Verb	Adverb
bath salts	Yes	No	No	No
toiletry	Yes	No	No	No

As nouns, toiletry is a hypernym of bath salts; that is, toiletry is a word with a broader meaning than bath salts:

bath salts: a preparation that softens or scents a bath
toiletry: artifacts used in making your toilet (washing and taking care of your body)

Other hypernyms of bath salts include toilet articles.

bath salts (noun)	toiletry (noun)
a preparation that softens or scents a bath	artifacts used in making your toilet (washing and taking care of your body)