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§ 21. Interlingue leaves words their natural terminations, and does not prescribe certain final vowels for certain classes of words. Cangurú, villa, radio, matre, midí.

§ 22. The neutral final vowel -e is found in many nouns to fix establish the correct pronounciation of the final consonant, for euphony, or to distinguish the noun from a similar adjectival or verbal form. Pace, image, rose, libre, cable, altruisme, curve, centre, central, centrale, directiv, directive, marine, circulare, cantate, infinite, tangente.

§ 23. A grammatical gender does not exist. All nouns are masculin, feminine or neutral according to their meaning.

§ 24. One can indicate the gender in names for entities: -o indicates masculine, -a the feminine. Anglese, angleso, anglesa, cavall, cavallo, cavalla. Words such as patre, matre etc. do not require gender endings, because they are masculine or feminine on their own. In other nouns -o indicates one special, individual, singular, concrete, -a one general, extended, collective, common, as well as action, location and time. rosiero, rosiera, lago, aqua, promenada, plazza, pasca.

§ 25. Some nouns form derivatives by adding u / at respectively* to the stem; they retain the u / a also in the non-derivative forms. manu, manual, sexu, sexual, sexualitá, gradu, gradual, graduation, sistema, sistematic, sistematico, sistematisar, sistematisation, dogma, dogmatic, dogmatisme, drama, dramatic, dramaturgo, aqua, aquatic, clima, climatic, climatolog, climatologie, climatologic.