This is the 13330th most frequent Russian word.
мусульман
"Мусульман" means "Muslim" (a follower of Islam) in English.
The word 'мусульман' is used in the accusative plural form to refer to people of the Muslim faith.
Я встретил группу мусульман в парке.
I met a group of Muslims in the park.
Here 'мусульмане' is the nominative plural form, functioning as the subject of the sentence.
Мусульмане празднуют Рамадан каждый год.
Muslims celebrate Ramadan every year.
In this sentence, 'мусульман' is in the genitive plural case, indicating possession or relation.