This is the 9662nd most frequent Russian word.
чаулина
It appears "чаулина" does not exist as a standard word in Russian; it may be a typo, name, or specialized term.
The word 'чаулина' is used here as a proper noun to refer to a person or entity.
Я встретил чаулина в парке.
I met a Chaulina in the park.
In this sentence, 'чаулина' serves as the subject of the sentence, emphasizing the qualities of the person named Chaulina.
Чаулина была очень интересным собеседником.
Chaulina was a very interesting interlocutor.
Here, 'чаулина' is used as the object of the sentence, indicating the topic of discussion.