🇧🇷 Portuguese

o problema, not a problema: Portuguese's Gender Exceptions

o problema, não a problema: As Exceções de Gênero do Português

October 10, 2026

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Portuguese sorts nouns into two genders, o (masculine) and a (feminine), and teaches a simple spelling rule to help beginners guess: words ending in -o are usually masculine, words ending in -a are usually feminine. The rule works most of the time -- and then there's o problema ("the problem"), ending in -a and stubbornly masculine. Comparing every noun in this dictionary's Portuguese-English pair against the gender its ending predicts turns up 268 mismatches, falling into a few clear, learnable patterns.

Profession words that go either way

A family of words for people's professions or roles ends in -ista or another unstressed -a, and simply changes its ARTICLE, not its spelling, to match the person: o artista / a artista (artist), o jornalista / a jornalista (journalist), o dentista / a dentista (dentist), o atleta / a atleta (athlete), o colega / a colega (colleague). These aren't really exceptions to the rule at all -- they were never masculine-only words to begin with.

Greek roots that stayed masculine

A huge cluster of everyday words borrowed from Greek keep their original masculine gender despite ending in -a: o problema (problem), o sistema (system), o clima (climate), o mapa (map), o dia (day), o tema (theme), o poema (poem), o programa (programme), o drama (drama), and o diploma (diploma) are just a handful of dozens. Spanish has the exact same pattern with the exact same words (el problema) -- both languages inherited it from Greek at the same time.

The hidden feminine ending inside -ão

Here's a trap that looks like the opposite problem: lots of common words end in -ção, -dão, or -tão -- all of which END in the letter "o" -- and are feminine anyway: a gestão (management), a conexão (connection), a digestão (digestion), a aptidão (aptitude), a solidão (loneliness), a escuridão (darkness). That's because "-ção"/"-dão"/"-tão" aren't really the masculine "-o" ending at all -- they're a completely different, extremely productive suffix that turns a verb into an abstract noun (much like English "-tion"), and it's reliably feminine. The real exceptions run the other way: o coração (heart), o calção (shorts), o artesão (craftsman), o blusão (jacket), and o parmesão (parmesan) all end in that same "-ção"/"-são" pattern and are masculine anyway.

-ite: a medical suffix, and an unrelated ending

Medical words for an inflammation genuinely do end in a reliable feminine "-ite" suffix, borrowed from Greek: a hepatite (hepatitis), a bronquite (bronchitis), a gastrite (gastritis). But plenty of everyday words just happen to end in the same four letters without being medical terms at all, and they're masculine: o leite (milk), o limite (limit), o convite (invitation), o site (website), o satélite (satellite), o apetite (appetite).

Every entry page in this Portuguese dictionary already shows this at a glance: the background colour is the word's real gender, and the underline is the gender its ending would have predicted -- so a trap like o problema is visible before you even read the definition.