This is the 9887th most frequent German word.
ovn
It seems there is a misunderstanding, as "ovn" is not a German word. If you meant something else, please clarify!
'Holzofen' specifies a type of oven that uses wood as fuel, often for heating.
Sie benutzten den Holzofen, um das Haus zu heizen.
They used the wood stove to heat the house.
Here, 'Ofen' refers to an oven or a stove used for cooking.
Der Ofen ist heiß.
The oven is hot.
'Ofen' refers to a kitchen appliance used for baking or roasting food items.