This is the 8377th most frequent Russian word.
москвичи
"Mосквичи" means "Muscovites," referring to people from Moscow.
This usage shows the word as a noun in its plural form referring to inhabitants of Moscow.
Москвичи любят гулять по Красной площади.
Muscovites love to stroll around Red Square.
The word here is in its plural genitive form, used as the object of the action.
Я встретил москвичей в парке вчера.
I met Muscovites in the park yesterday.
In this sentence, the word appears in its singular form, describing a specific person's origin.