hi rotzá mechonát kvisá chadashá.
What does כביסה exactly mean, and what's its part of speech ?
The first noun in the construct is called the nismach (נסמך) and the following noun somech(סומך).
Well, כְּבִיסָה "washing, laundering" is the verbal noun of כָּבַס "to wash".
Because the last one broke the house.