der Bulgare
Bulgarian
A male person who has Bulgarian citizenship or comes from Bulgaria.
Mein Nachbar ist Bulgare und hat mir von der Schwarzmeerküste erzählt.
My neighbor is Bulgarian and told me about the Black Sea coast.

Bulgarian
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Bulgarian
A male person who has Bulgarian citizenship or comes from Bulgaria.
Mein Nachbar ist Bulgare und hat mir von der Schwarzmeerküste erzählt.
My neighbor is Bulgarian and told me about the Black Sea coast.

'Der Bulgare' (the Bulgarian) belongs to the N-declension. This means that the noun takes the ending '-n' in all cases except the nominative singular.
Ich habe gestern mit einem Bulgaren gesprochen.
I spoke with a Bulgarian yesterday.
The word belongs to a family: the country is called 'Bulgarien' (Bulgaria), the adjective is 'bulgarisch' (Bulgarian), and the female person is 'die Bulgarin' (the Bulgarian woman).
Sie kommt aus Bulgarien und spricht fließend Bulgarisch.
She comes from Bulgaria and speaks fluent Bulgarian.
As a noun referring to a person, 'der Bulgare' (the Bulgarian) is always capitalized. The related adjective 'bulgarisch' (Bulgarian) is written in lowercase.
Er ist Bulgare.
He is Bulgarian.
Bulgarian
'bulgarisch' and 'der Bulgare' both refer to Bulgaria. The difference is in the part of speech and in how they are used. 'bulgarisch' is an adjective and describes, for example, a language, food, a culture, or a person. 'der Bulgare' is a noun and means a man from Bulgaria or with Bulgarian citizenship. Learners may confuse the words because they look very similar. Remember: 'bulgarisch' describes something; 'der Bulgare' is a person.

In unserer Nachbarschaft wohnt ein Bulgare, der sehr gut Deutsch spricht.
A Bulgarian man lives in our neighborhood who speaks German very well.
Meine Nachbarin kocht heute ein bulgarisches Gericht.
My neighbor is cooking a Bulgarian dish today.