This is the 9567th most frequent German word.
moosbrunner
"Moosbrunner" is not a standard German word; it might be a proper noun, like a place name or surname.
Here, 'moosbrunner' is used as a noun, presumably referring to a specific plant or organism with no direct English equivalent.
Ich habe gestern einen seltenen Moosbrunner in meinem Garten gefunden.
Yesterday, I found a rare 'moosbrunner' in my garden.
In this context, 'moosbrunner' is referring to a moss-covered spring or fountain, derived from the nouns 'Moos' (moss) and 'Brunnen' (spring or fountain).
Die Kinder spielten fröhlich am Moosbrunnen im Park.
The children played happily by the moss-covered spring in the park.
Here, 'moosbrunner' is used again as a term for a specific type of entity, possibly a plant adapted to damp environments.