optician vs lens maker

optician and lens maker both are nouns.

Word	Noun	Adjective	Verb	Adverb
optician	Yes	No	No	No
lens maker	Yes	No	No	No

As nouns, optician and lens maker are synonyms defined as:

optician and lens maker: a worker who makes glasses for remedying defects of vision

optician (noun)	lens maker (noun)
a worker who makes glasses for remedying defects of vision	a worker who makes glasses for remedying defects of vision