This is the 551st most frequent Hebrew word.
יתר
The Hebrew word "יתר" means "remainder," "excess," or "advantage," depending on context.
The word 'יתר' in this context acts as an adjective meaning 'surplus' or 'extra'.
היה יתר מזון בסיום הארוחה, אז ארזנו אותו לקחת הביתה.
There was surplus food left at the end of the meal, so we packed it to take home.
Here, 'יתר' functions as an adjective describing the noun 'time', suggesting remaining or additional.
עליי לנצל את יתר הזמן שנשאר לי לפני שהזמן נגמר.
I need to make use of the extra time I have left before time runs out.
In this case, 'יתרונו' means 'his advantage', where 'יתר' forms the root for the notion of having an advantageous quality.