This is the 415th most frequent Croatian word.
njegovu
"Njegovu" means "his" (used for a singular, masculine object in the accusative or possessive form).
'Njegovu' is used to describe ownership of the noun 'house', which is feminine in this context.
Vidjeli smo njegovu kuću jučer.
We saw his house yesterday.
'Njegovu' here functions in the accusative case to denote the noun 'wish', referring to what is fulfilled.
Otišla sam u park zbog njegovu želju.
I went to the park because of his wish.
'Njegovu' modifies the noun 'book', used here to express direct object ownership.