This is the 750th most frequent Icelandic word.
grunnskóla
"Grunnskóla" means "primary school" or "elementary school" in English.
The word "grunnskóla" is used generically to refer to the institution of elementary school.
Krakkarnir fóru í grunnskóla í morgun.
The children went to elementary school this morning.
Here, "grunnskóla" refers to the workplace environment of the elementary school.
Hún starfar sem kennari í grunnskóla.
She works as a teacher in an elementary school.
In this sentence, "grunnskóla" indicates the architectural or physical concept of the school.