This is the 618th most frequent Croatian word.
tvrtka
"Tvrtka" means "company" or "firm" in English.
tvrtku here is in the accusative singular form, referring to 'a company' as the direct object of the verb 'founded'.
Osnovala sam tvrtku koja se bavi razvojem softvera.
I founded a company specializing in software development.
tvrtka here is in the nominative singular form, functioning as the subject of the sentence.
Ta tvrtka ima dugogodišnje iskustvo u proizvodnji namještaja.
That company has many years of experience in furniture manufacturing.
tvrtki here is in the locative singular form, used after the preposition 'u' to indicate location within the company.