The willow-warbler: a common British name and also book-name.(noun)
The Century Dictionary (Public Domain)
Use "willow-wren" in a sentence
"It is far from wishing for the modest concealment of the true creeper (Certhia familiaris); nor does it, like that bird, run up the trunks of trees, but industriously, after the manner of a willow-wren, hops about, and searches for insects on every twig and branch."
"When the gnat had heard that, she flew away again, and revealed everything, with the greatest minuteness, to the willow-wren."
"The willow-wren also came flying through the air with his army with such a humming, and whirring, and swarming that every one was uneasy and afraid, and on both sides they advanced against each other."