The following tables show examples of invariable nouns, i.e., words that have one form for both singular and plural.
1) Monosyllables
| Singular | English Equivalent | Plural | English Equivalent |
| il dì | day | i dì | days |
| il ré | king | i ré | kings |
| il sé | self | i sé | selves |
| il sì | yes | i sì | yeses |
| il si | B (musical note) | i si | B's (musical notes) |
| il su | up | i su | ups |
| il tè | tea | i tè | teas |
2) Nouns ending with a consonant
| Singular | English Equivalent | Plural | English Equivalent |
| autobus (lo) | bus | gli autobus | buses |
| bar (il) | café | i bar | cafes |
| computer (il) | computer | i computer | computers |
| condor (il) | condor | i condor | condors |
| modem (il) | modem | i modem | modems |
| monitor (il) | monitor | i monitor | monitors |
| pallet (il) | pallet | i pallet | pallets |
| pancreas (il) | pancreas | i pancreas | pancreases |
| pandit (il) | pundit | i pandit | pundits |
| pantheon (il) | Pantheon | i pantheon | Pantheons |
| parquet (il) | wood floor | i parquet | wood floors |
| radar (il) | radar | i radar | radars |
| scanner (lo) | scanner | gli scanner | scanners |
| sport (lo) | sport | gli sport | sports |
| tram (il) | cable car | i tram | cable cars |
3) Foreign terms in general
| Singular | English Equivalent | Plural | English Equivalent |
| drive (il) | drive | i drive | drives |
| mouse (il) | mouse | i mouse | mice |
| mousse (la) | mousse | le mousse | mousses |
| paella (la) | paella | le paella | paellas |
| pànama (il) | Panama hat | i pànama | Panama hats |
| party (il) | party | i party | parties |
| pastiche (il) | pastiche | i pastiche | pastiche |
| pâté (il) | pâté | i pâté | pâtés |
| performance (la) | performance | le performance | performances |
| software (il) | software | i software | softwares |
4) Nouns ending with an accented vowel (for example, nouns indicating abstract qualities)
| Singular | English Equivalent | Plural | English Equivalent |
| babà (il) | rum cake | i babà | rum cakes |
| bebé (il) | baby | i bebé | babies |
| beltà (la) | beauty | le beltà | beauties |
| caffè (il) | coffee | i caffè | coffees |
| canapè (il) | sofa | i canapè | sofas |
| città (la) | city | le città | cities |
| civiltà (la) | civilization | le civiltà | civilizations |
| emù (lo) | emu | gli emù | emus |
| paltò (il) | overcoat | i paltò | overcoats |
| papà (il)q | father | i papà | fathers |
| pascià (il) | pasha | i pascià | pashas |
| virtù (la) | virtue | le virtù | virtues |
5) Abbreviated nouns
| Singular | English Equivalent | Plural | English Equivalent |
| àuto (la) (automobile) | car | le àuto | cars |
| cìnema (il) (cinematografo) | movie theatre | i cìnema | movie theatres |
| dìnamo (la) (l'apparecchio dinamoelettrico) | generator | le dìnamo | generators |
| mòto (la) (motocicletta) | byke | le mòto | bykes |
| parà (il) (paracadutista) | paratrooper | i parà | paratroopers |
| ràdio (la) (il radioricevitore) | radio | le radio | radios |
| stereo (lo) (stereofonico) | stereo | gli stereo | stereos |
| vìdeo (il) (la videocassetta) | videotape | i video | videotapes |
6) Nouns ending in "i"
| Singular | English Equivalent | Plural | English Equivalent |
| àlcali (lo) | alkali | gli àlcali | alkalis |
| àlibi (lo) | alibi | gli àlibi | alibis |
| cisti (la) | cyst | le cisti | cysts |
| crisi (la) | crisis | le crisi | crises |
| ipòfisi (la) | hypophysis | le ipofisi | hypophyses |
| paràbasi (la) | parabasis | le parabasi | parabases |
| paràfrasi (la) | paraphrase | le parafrasi | paraphrases |
| paràlisi (la) | paralysis | le paralisi | paralyses |
| parèntesi (la) | parenthesis | le parèntesi | parentheses |
| tèsi (la) | dissertation | le tèsi | dissertations |
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