This is the 151st most frequent Polish word.
innymi
"Others" or "different (ones)" (instrumental plural form of "inny").
Here, 'innymi' is the instrumental plural form of 'inny', used in the instrumental case with 'między' as it requires this case.
Rozumiem różnicę między innymi językami a polskim.
I understand the difference between other languages and Polish.
In this sentence, 'innymi' in the instrumental plural form denotes 'with other' and is used with 'z' which governs the instrumental case for showing accompaniment.
Lubimy spędzać czas z innymi ludźmi.
We like to spend time with other people.
Here, 'innymi' is again instrumental plural form, used after 'z' to indicate association or involvement.