Penna and Plumule

Plumule and penna are semantically related in plumage topic. In some cases you can use "Plumule" instead a noun "Penna", when it comes to topics like medium external feather.

Plumule noun - Down feather of young birds; persists in some adult birds.

Penna and plumule are semantically related in plumage topic. You can use "Penna" instead a noun "Plumule", if it concerns topics such as medium external feather.