This is the 3354th most frequent Russian word.
подоконнике
"Подоконнике" means "on the windowsill" in English.
Here, 'на подоконнике' indicates the placement of the flowers, again using 'на' to specify the surface they are on.
На подоконнике стоят цветы в красивых горшках.
Flowers in beautiful pots are standing on the windowsill.
In this example, 'на подоконнике' shows the location of the book, with 'подоконнике' in the prepositional case after 'на', highlighting the context of the setting.
Я случайно поставил книгу на подоконнике, и она намокла.
I accidentally placed the book on the windowsill, and it got wet.
In this sentence, 'на подоконнике' is used to describe the location where the cat is sitting, utilizing the preposition 'на' with the prepositional case of the noun 'подоконник'.