To avoid doubt, let's look at the most common cases of the use of the hyphen that remains the same after the spelling reform:
1. In words composed by juxtaposition that form a semantic unit, that is, in terms that come together to form a new meaning: great-uncle, porto-alegrense, luso-brazilian, lieutenant colonel, monday, dropper, umbrella, rainbow, prime minister, dark blue.
2. In words composed of botanical and zoological species: cauliflower, bem-te-vi, sweetheart, tea-eva, pumpkin, fennel, green beans.
3. In compounds with elements beyond, below, newly and without: overseas, newborn, without-number, newlyweds, below-spinning, etc.
4. In general, the phrases do not have a hyphen, but some exceptions continue because they are already established by the Usage: pink, crocodile, more-than-perfect, nest egg, cologne, point-blank, godsend.
5. In the strings of words, such as: Rio-Niterói bridge, Lisbon-Coimbra-Porto route and in historical or occasional combinations: Austria-Hungary, Angola-Brazil, Alsace-Lorraine, etc.
6. In formations with the prefixes hyper-, inter- and super- when associated with another term starting with r: hyper-resistant, interracial, super-rational, etc.
7. In formations with the prefixes ex-, vice-: ex-director, ex-president, vice-governor, vice-mayor.
8. In training with the prefixes post-, pre- and pro-: prenatal, preschool, pro-European, postgraduate, etc.
9. In enclisis and mesoclisis: love him, leave him, give yourself, embrace him, throw him and I will love him, I will speak to him, etc.
