"A teacher and a director"
Translation:Учитель і директор
They are interchangeable.
Most (all?) words in Ukr that start with в+consonant have their у+consonant counterpart (for the sake of euphony): вчитель-учитель, вже-уже, вночі-уночі, впасти-упасти.
You should try to avoid congestion of consonants and use у-versions after a consonant and at the beginning of a sentence. But this rule is sometimes neglected and because of that в-versions of some words became much more common