What nouns retain the f in the plural form?

Words that end with a double f usually do not becomes ves when pluralised. Roof is a Word that should become roofs when pluralised but through common usage the plural 'rooves' is increasingly recognised.

Other examples include: -Cliff becomes cliffs

-Proof (for example a photographic proof) becomes proofs

-Pontiff becomes Pontiffs (if you were speaking of more than one Pope ie Pontiffs have ordinarily been male).

-Bailiff becomes bailiffs

-Belief becomes beliefs

-Bluff becomes bluffs