Why not? "Okno" is Nominative.
I mean why the last "o" is stressed. The second-to-last vowel is usually stressed.
It's just TTS, don't expect too much from it.
Large would also fit the bill same connotation
And it's accepted.
Same for "huge."
That's too much, it's "wielkie" or even "ogromne".
I clicked on it and didn't see the word, therefore I thought it was not., our stateside English has so many quirks that the British do not use. We are working our way to pidgin English the the use of regional and slang wording.
The hints come mostly from the default English sentences, and generally 'big' is starred and 'large' just accepted. The fact that it's not in the hints doesn't mean that it's not accepted.
I very much appreciate your clearing that up, there are so many times I would use another word in place of the ones I see in the hints. Thanks