羽冠 is read as うかん (ukan) and means bird's crest.
うかん
ukan
かんう
bird's crest
はおり
haori (Japanese formal coat)
はぶり
flapping of wings
うべん
vexillum
はおる
to put on (coat, gown, etc.)
うかとうせん
a sense of release (as if one had wings and were riding on air)
はばたき
fluttering or flapping of wings
はがいじめ
full nelson
うじょうみゃく
pinnately venation
はおりげいしゃ
geisha from the Fukagawa red light district in Edo (Edo period)
はおりむし
vestimentiferan (any tube worm of order Vestimentifera)
はねかくし
rove beetle