What is the plural of "proof"? English Grammar Parts of Speech Nouns 1 Answer Patrick H. Apr 4, 2016 The plural of "proof" is "proofs". Answer link Related questions Question #0c999 What is a noun phrase in linguistics? Why is "internet" a proper noun? Which proper nouns should be capitalized? What are some examples of plural nouns? Can you change a common noun to a proper noun? What's the definition of a proper noun? What are some examples of collective nouns? What are some examples of common nouns? What are some examples of compound nouns? See all questions in Nouns Impact of this question 31987 views around the world You can reuse this answer Creative Commons License