eyewash vs lotion

eyewash and lotion both are nouns.

Word	Noun	Adjective	Verb	Adverb
eyewash	Yes	No	No	No
lotion	Yes	No	No	No

As nouns, lotion is a hypernym of eyewash; that is, lotion is a word with a broader meaning than eyewash:

eyewash: lotion consisting of a solution used as a cleanser for the eyes
lotion: liquid preparation having a soothing or antiseptic or medicinal action when applied to the skin

Other hypernyms of eyewash include application.

eyewash (noun)	lotion (noun)
lotion consisting of a solution used as a cleanser for the eyes	any of various cosmetic preparations that are applied to the skin
	liquid preparation having a soothing or antiseptic or medicinal action when applied to the skin