der Iraner
Iranian man
A male person who comes from Iran or has Iranian citizenship.
Mein neuer Kollege ist Iraner und hat uns persischen Tee mitgebracht.
My new colleague is Iranian and brought us Persian tea.

Iranian
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Iranian man
A male person who comes from Iran or has Iranian citizenship.
Mein neuer Kollege ist Iraner und hat uns persischen Tee mitgebracht.
My new colleague is Iranian and brought us Persian tea.

The word is formed from the country name 'Iran' and the ending '-er'. This pattern is very common for masculine nationality nouns in German.
Der beste Schachspieler im Verein ist ein Iraner.
The best chess player in the club is Iranian.
'Der Iraner' (the Iranian man) is a noun and refers to the person. The corresponding adjective is 'iranisch' (Iranian) and describes things or qualities. You say: 'Er ist Iraner' (He is Iranian), but 'Das ist iranische Kunst' (That is Iranian art).
Er ist Iraner und lebt seit fünf Jahren in Deutschland.
He is Iranian and has been living in Germany for five years.
As a noun, 'Iraner' is always capitalized. The adjective 'iranisch' is written in lowercase unless it appears at the beginning of a sentence.
Ein Iraner hat das Restaurant eröffnet.
An Iranian man opened the restaurant.
Iranian
'iranisch' and 'der Iraner' are both connected with Iran, but grammatically they are not the same type of word. 'iranisch' is an adjective and describes, for example, food, music, culture, language, or a person. 'der Iraner' is a noun and means a male person from Iran or with Iranian citizenship. The words can be confused because both can express origin. But you do not say 'ein iranisch' when you mean a person; you say 'ein Iraner' or, with an adjective, 'ein iranischer Mann' (an Iranian man).

Mein neuer Nachbar ist Iraner und spricht sehr gut Deutsch.
My new neighbor is Iranian and speaks German very well.
Sie hört gern iranische Musik auf dem Weg zur Arbeit.
She likes listening to Iranian music on her way to work.