Try and guess from the list of names which are books in the Old and New Testaments of the Protestant Bible, but be careful you have limited misses before you fail!
Not to be technical, but it is labeled as Psalm because if you were to cite it you would not say Psalms 12:10. The correct way is Psalm 12:10. Proverbs is what the book itself is called so when citing that book you use the plural version. But yes, to refer to all of the psalms as plural is correct english but the book as a whole is Psalm.