This is the 4403rd most frequent German word.
grösste
"Grösste" means "largest" or "greatest" in English.
Here 'größte' is used as a superlative adjective describing 'Geschenk', signifying the utmost quality of the gift.
Das größte Geschenk ist die Liebe.
The greatest gift is love.
In this sentence, 'größte' is used as a superlative adjective for 'Stadt', indicating the city with the largest size.
Sie hat die größte Stadt Deutschlands besucht.
She visited the largest city in Germany.
'Größte' is applied here as a superlative adjective qualifying 'Problem', emphasizing the problem with the highest significance or impact.