Ruwāt (رواۃ) is the plural of rāwī: people who transmit a Hadith.
Our example mentions Umar and Alqama. Both are among the narrators of this Hadith because both reported it to others.
• For one person: rāwī (راوی).
• For the people transmitting a Hadith: ruwāt (رواۃ).