pronoun (n.)

"word used instead of a noun to avoid repetition of it," mid-15c., from Old French pronon, pronom, and directly from Latin pronomen "word standing in place of a noun," from pro, here meaning "in place of," + nomen "name, noun" (from PIE root *no-men- "name"). The Latin word is a loan-translation of Greek antonymia. The form of the English and French words was altered to conform with noun.