This is the 260th most frequent Croatian word.
njegove
"Njegove" means "his" in English, indicating possession.
'Njegove' is used to describe ownership and must match the noun 'slike' in gender, number, and case (plural, accusative here).
Gledam njegove slike iz djetinjstva.
I am looking at his pictures from childhood.
'Njegove' is used as a possessive pronoun related to the noun 'knjige' and agrees in gender, number, and case.
Njegove knjige su na stolu.
His books are on the table.
'Njegove' would be changed to 'njegovoj' and 'njegovim' in the sentence due to the respective nouns and grammatical roles, showing its possessive use.