It does not seem particularly difficult. The doubled letters are already known from the constituent words class and room.
the classroom is called 'la classe' in French
aula
The word for a place of education is one word, classroom.
(das) Klassenzimmer
There are several translations for classroom in French: classe, salle de classe, or salle.
Das klassenzimmer ist leer
les consignes en classe
I'm assuming you were trying to spell 'Difficult'
Rhyme is a difficult word to spell.
The correct spelling is "difficult"
Klassenraum=============The more commonly used word would be das Klassenzimmer
oughtn't