This is the 9478th most frequent Japanese word.
筑豊
Chikuhō: A region in Fukuoka Prefecture, Japan, historically known for coal mining.
In this sentence, '筑豊' is introduced as a proper noun referring to a specific geographical location.
筑豊は、福岡県にある地域の名前です。
Chikuhō is the name of a region in Fukuoka Prefecture.
Here, '筑豊' is used as part of a compound noun '筑豊地方' to describe the area in terms of its general features.
筑豊地方には豊かな自然があります。
The Chikuhō region has abundant nature.
In this case, '筑豊' describes linguistic characteristics associated with the region in the form of its dialect.