collyrium vs eyewash

collyrium and eyewash both are nouns.

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

As nouns, collyrium and eyewash are synonyms defined as:

collyrium and eyewash: lotion consisting of a solution used as a cleanser for the eyes

Other synonyms of collyrium include eye-lotion.

collyrium (noun)	eyewash (noun)
lotion consisting of a solution used as a cleanser for the eyes	lotion consisting of a solution used as a cleanser for the eyes