The best replacement for proper nouns is common nouns.

The best alternatives to proper nouns are rated as following:

★★★★★	common nouns
★★	pronouns
★	nouns
	common
	proper adjectives

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Speaking about proper nouns, one probably shouldn't forget about capital letters.

Other search terms related to proper nouns and their ratings are:

★★★★★	capital letters
★★★	definite article

You have in mind a companion for proper nouns and it is not yet here? Propose!

Google Trends

Scale is based on the average worldwide traffic of proper nouns in all years. Click on graph for more.

proper nouns

common nouns

pronouns