This is the 701st most frequent Ukrainian word.
школи
"Школи" in English means "schools."
'Школи' here is the genitive singular form, used after the preposition 'до' (to).
Вона йде до школи.
She is going to the school.
'Школами' here is the instrumental plural form, used to designate the means or location via associated structures.
Поруч зі школами є парк.
There is a park next to the schools.
'Шкіл' is the genitive plural form, used in possessive constructions to indicate ownership.