I was looking through a feature in some Romance languages, Spanish and French, where nouns in Spanish change depending on gender. I was wondering if Latin had a few of these. Here are examples in Spanish and in French.
Particular examples are
el consonante: rhyme, la consonante: the consonant (Spanish)
le bal: dance, la balle: ball (French)
Nothing contrived such as canis, canis, m/f meaning one is a male dog and the other is female.
Nemo, neminis, m/f and dies, diei, m/f are nouns of ambiguous gender which is a different situation.