腋窩[ekika] armpit
山窩[sanka] group of mountain nomads (in Japan)
眼窩[ganka] eye socket
腋窩腺[ekikasen] axillary gland
燕窩[enka] swift's nest (used to make bird's nest soup)

中心窩[chuushinka] fovea centralis
眼窩底[gankatei] orbital floor (thin bone floor of eye socket)
蜂窩[houka] wasp nest
私窩子[shikashi] prostitute
膝窩[shikka] popliteal fossa

膝蓋骨[shitsugaikotsu] kneecap
膝蓋腱反射[shitsugaikenhansha] kneecap (patellar) reflex
膝関節[shitsukansetsu] knee joint
膝がしら[hizagashira] kneecap
片膝[katahiza] one knee

諸膝[morohiza] both knees
膝小僧[hizakozou] kneecap
膝許[hizamoto] near one's knee
膝行[shikkou] moving forward by sliding on one's knees (in the presence of high-ranking individuals)