This is the 1499th most frequent Arabic word.
العراقي
"The Iraqi" (used to refer to someone or something from Iraq).
Here, 'العراقي' is used as an adjective describing 'الرجل' (the man), indicating his nationality.
الرجل العراقي يعمل بجد لبناء بلاده.
The Iraqi man works hard to build his country.
In this sentence, 'العراقيون' is a plural noun form of 'العراقي', referring to the people of Iraq collectively.
العراقيون يحبون تاريخ وطنهم ويفخرون به.
Iraqis love the history of their homeland and are proud of it.
Here, 'العراقية' is an adjective that describes 'الثقافة' (culture), referring to it as related to Iraq.