cave, pouch
窩 centers on a hollow space or enclosure: a cave, a pouch, or any small cavity that holds or shelters something.
窩 combines 穴 (hole, cavity) with 咼, which likely contributes the sound and may relate to a hollow or curved shape. The exact historical development of 咼 is uncertain.
The top 穴 is a hole or cave, and the bottom 咼 looks like a pouch with something inside. Picture a cave that doubles as a pouch, holding hidden treasures.
For カ, imagine a car parked inside a cave: car -> カ, and the cave shelters it like a pouch.
orbit; eye socket
group of mountain nomads (in Japan); group of mountain people; the Sanka
armpit; axilla
pouch of Douglas; rectouterine pouch
fovea centralis
phlegmon in floor of oral cavity; Ludwig's angina
swift's nest (used to make bird's nest soup)
rectouterine pouch; pouch of Douglas
orbital floor (thin bone floor of eye socket)
prostitute; harlot
dental cavity (due to caries)
cavity margin (e.g. tooth, body)
gastric pits
axillary artery; arteria axillaris
axillary gland
cryptitis
popliteal fossa; popliteal space; area behind the knee
popliteal artery
popliteal vein
beehive; hive; honeycomb