This is the 305th most frequent Finnish word.
suuria
"Suuria" means "big" or "large" in plural partitive form in Finnish.
In this sentence, 'suuria' is the partitive plural form of the adjective 'suuri' (large/great), agreeing with the noun 'puita' (trees) in case and number, for description.
Näin metsässä suuria puita.
I saw large trees in the forest.
Here, 'suuria' modifies 'tarinoita' (stories) in the partitive plural, providing a qualitative attribute ('great').
Kirjassa on suuria tarinoita elämästä.
The book contains great stories about life.
In this case, 'suuria' describes 'unelmia' (dreams), once again as an adjective in the partitive plural, emphasizing the scale or significance of the dreams.