Masculine noun plurals in -co and -go (-chi, -ghi, -ci, -gi)

When masculine nouns end in -co or -go, forming their plural requires a spelling change. The final vowel becomes -i, but you must also decide whether to keep the consonant sound "hard" (like a "k" or hard "g") or let it become "soft" (like a "ch" or "j").

The stress rule: "-chi" vs. "-ci"

For most words, the plural ending depends on where the emphasis falls in the singular word:

  • Stress on the next-to-last syllable: Add an h to keep the hard sound (-chi, -ghi). For example, elenco (list) is stressed on the len, so the plural is elenchi.
  • Stress on the third-to-last syllable: Do not add an h. The sound softens (-ci, -gi). For example, storico (historian) is stressed on the sto, so the plural is storici.

Notice how this single sentence uses both patterns:

The publishers have prepared the lists of the historians.
Gli editori hanno preparato gli elenchi degli storici.

The "-logo" trick

Words ending in -logo often have the stress on the third-to-last syllable, but they have their own simple pattern based on meaning rather than stress:

  • Things and concepts keep the hard sound by adding an h (-ghi).
  • People and professions take the soft sound without an h (-gi).

Because catalogues, prologues, and epilogues are things, they take the hard -ghi ending:

I would like the catalogues of these new authors.
Vorrei i cataloghi di questi nuovi autori.
These authors never write prologues or epilogues.
Questi autori non scrivono mai prologhi o epiloghi.

But a word like psicologo (psychologist) refers to a person, so it takes the soft -gi ending:

Psychologists also study the past, but historians know it better.
Anche gli psicologi studiano il passato, ma gli storici lo conoscono meglio.

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