The Word is:”they”
they
/ðeɪ/
pronoun
pronoun: they
1. used to refer to two or more people or things previously mentioned or easily identified.
“the two men could get life sentences if they are convicted”
“the rest, as they say, is history”
people in authority regarded collectively.
“they cut my water off”
2. used to refer to a person of unspecified gender.
“ask a friend if they could help”
Source credit: Google