den¹ /den/

1. The hollow lair of a wild animal
2. A pit or cave
3. A haunt of vice or misery
4. A private domestic room or office for work or pleasure (informal)
5. A Cub Scout group (US)
6. A narrow valley, a dean (Scot)

To retire to a den

den mother noun (US)

1. An adult female leader of a Cub Scout group
2. Any adult female protective figure in general

• opioid
• opioids
• opisometer
• opisometers
• opisth-
• opistho-
• opisthobranch
• Opisthobranchia
• opisthobranchs
• opisthocoelian
• opisthocoelous
• opisthodomoi
• opisthodomos
• opisthoglossal
• opisthognathous
• opisthograph
• opisthographic
• opisthographies
• opisthographs
• rattlebrain
• rattle-brained
• rattlebrains
• rattled
• rattlehead
• rattle-headed