becomes -ž in only two cases: knez: kneže "prince" and vitez: viteže "knight". The loss of the unsteady a can trigger a sound change by hardening of consonants, as in vrabac: vrapče "sparrow" (not vrabče), lisac: lišče "male fox" (not lisče) and ženomrzac: ženomršče "misogynist" (not ženomrzče). There may be a loss of -t before -c like in otac: oče "father" (instead of otče). svetac: sveče "saint" (instead of svetče). When these phonetic alterations would substantially change the base noun, the vocative remains equal to the nominative, for example tetak "uncle", mačak "male cat", bratac "cousin". This also holds true for foreign names ending with -k, -g and -h like Džek (Jack), Dag (Doug), King, Hajnrih. Male names ending with -o and -e have a vocative equal to the infinitive: Marko, Mihailo, Danilo, Đorđe, Pavle, Radoje etc. Second declension The second declension affects nouns with the ending -a. These are mainly of feminine but sometimes also of masculine gender. These nouns have a vocative suffix -o: riba: ribo "fish", sluga: slugo "servant", kolega: kolego "colleague", poslovođa: poslovođo "manager". Exemptions to this rule are male and female names, which have a vocative equal to the nominative, e. g. Vera, Zorka, Olga, Marija, Gordana, Nataša, Nikola, Kosta, Ilija etc. However, this is different for twosyllabic names with an ascending accent such as Nâda, Zôra, Mîca, Nêna and the male names Pêra, Bôža, Pâja etc., which form vocatives with -o: Nâdo, Zôro, Mîco, Pêro, Bôžo, Pâjo etc. Denominations of relatives like mama "mom", tata "dad", deda "grandfather", tetka "aunt", ujna "aunt" (mother's brother's wife), strina "aunt" (father's brother's wife), baba "grandmother" have vocatives equal to the nominative. This also holds true for country names ending in -ska, -čka, -ška. Nouns ending with the diminutive suffix -ica that consist of three or more syllables have a vocative with -e: učiteljica: učiteljice "female teacher", drugarica: drugarice "girlfriend", tatica: tatice "daddy", mamica: mamice "mommy". This also applies to female names Danica: Danice, Milica: Milice, Zorica: Zorice, and the male names Perica: Perice, Tomica: Tomice. Nouns of this class that can be applied to both males and females usually have a vocative ending of -ico (pijanica: pijanico "drunkard", izdajica: izdajico "traitor", kukavica: kukavico "coward"), but vocatives with -ice are also seen. The use of vocative endings for names varies among Serbo-Croatian dialects. People in Croatia often use only nominative forms as vocatives, while others are more likely