кас

Маълум шуд, ки дар меҳмонхона фақат барои чаҳор кас ҷой будааст.
It became clear that in the guest house there was only room for four people.
Ман ғайр аз ҳамон духтар, ҳеҷ каси дигарро ба занӣ намегирам.
Besides that girl, I will not take another person as my wife.

Bonus:
Synonyms: шахс, одам, нафар

Notice in the first person that the plural is not used. This is because in Tajik, the plural form of the noun is not used after a number.

See also –
ҳар кас: everybody
ҳеҷ кас: somebody