Alternatively you could use "gestor", which has the same stem. "Gestionar" and "gerente" have different origins, so no wonder they look very different.
But yes, most (all?) European languages have vastly more complex morphology than English.
But yes, most (all?) European languages have vastly more complex morphology than English.
That'll be different depending on the language, you can't simply transliterate words to another language, the mapping may change things and the rules might be different.
For example, in English "manage / managers", are practically the same, but transliterating to Spanish can give you "gestionan / gerentes", which diverge very early on.