Is it OK to say persons?

Answer 1

It depends on the context. Persons is technically correct grammar when talking about a certain number of humans. (I'm not going to use persons or people in my explanation to make things clearer.) For example, if you were talking about how many humans showed up to your party last night, you would say: "Yeah, man, about 20 persons were there last night."

You use the word "people" when talking about a group or a generalized amount. For a group example, if you wanted to talk about the humans working at McDonald's, you would say, "I don't know how those people are still working there." (No offense if you work at McDonald's.) For a generalized amount example, if you wanted to talk, again, about how many humans came to your party, you would say, "Yeah, man, a lot of people came to the party last night."

However, "people" is becoming more mainstream for anytime you're talking about more than one human. So while "persons" may technically be grammatically correct, others will probably think you're weird if you start saying "persons."

Answer 2

Yes, 'persons' is the correct plural form of the noun person.