Who is a leader in Leviticus 21:4?

Answer From The Annual Reading Schedule - Week 27 Notes For Leviticus: Leviticus 21:1 specifically mentions the Sons of Aharon (Aaron) and verse 6 specifically says why they are commanded what they are commanded in verses 4 and 5 – which is because they bring the offerings of Yahweh made by fire and the bread of their Elohiym. Who does these things except the Sons of Aharon? So "leader" or "chief man" or whatever word is here seems to be talking only still about the Sons of Aharon. I don't think it is specifically the High Priest being talked about only in verse 4, although he certainly would be included in it, but I don't think it's referring only to him. The reason being, later on in Leviticus 21:10 it specifically singles out the High Priest by saying "high priest". If verse 4 were also about the High Priest, I would expect the same words to be there.