Danish deck
mug
noun·a2

mug

Mold or mildew; fungal growth on food or damp surfaces

Der er mug på brødet.

Maden var dækket af mug.

indefinite singularen mug
a mold (indefinite singular)
definite singularmugen
the mold (definite singular)
indefinite pluralmug
molds (indefinite plural) or mold (mass noun)
definite pluralmuggene
the molds (definite plural)