This is the 9811th most frequent German word.
niederösterreicher
A person from Lower Austria (Niederösterreich).
Here, 'Niederösterreicher' refers specifically to a person from Lower Austria, indicating a regional identity in the subject of the sentence.
Der Niederösterreicher trinkt gern Grünen Veltliner.
The Lower Austrian enjoys drinking Grüner Veltliner.
In this case, 'Niederösterreicher' is used to identify a group member's geographical origin or heritage.
Wir haben einen Niederösterreicher in unserer Gruppe.
We have a Lower Austrian in our group.
Here, 'Niederösterreicher' is used in the plural form to refer to the people from Lower Austria collectively.