This is the 758th most frequent Croatian word.
njom
The Croatian word "njom" means "her" or "with her" in English, used in the instrumental case.
In this sentence, 'njom' is the instrumental case of 'ona' (she/her), used after the preposition 's' (with).
Razgovarali smo s njom jučer.
We talked with her yesterday.
Here, 'njom' again is in the instrumental case, showing the means or agency of the conversation.
Oduševljen sam njezinim uspjehom zbog razgovora s njom.
I am pleased with her success because of the conversation with her.
In this example, 'njom' complements 'razgovor s' (conversation with), emphasizing the interaction.