This is the 7783rd most frequent Russian word.
иностранец
A foreigner.
The word 'иностранец' denotes a person from a different country.
Он разговаривал с иностранцем в парке.
He spoke with a foreigner in the park.
The word 'иностранцам' here is in the dative plural form, referring to multiple individuals.
Она помогает иностранцам изучать русский язык.
She helps foreigners learn Russian.
The word 'иностранцем' is in the instrumental case, indicating the means by which the action was performed.