mapper vs clerk

mapper and clerk both are nouns.

Word	Noun	Adjective	Verb	Adverb
mapper	Yes	No	No	No
clerk	Yes	No	Yes	No

As nouns, clerk is a hypernym of mapper; that is, clerk is a word with a broader meaning than mapper:

mapper: a clerk who marks data on a chart
clerk: an employee who performs clerical work (e.g., keeps records or accounts)

mapper (noun)	clerk (noun)
a clerk who marks data on a chart	an employee who performs clerical work (e.g., keeps records or accounts)
	a salesperson in a store

mapper (verb)	clerk (verb)
	work as a clerk, as in the legal business