The term "first teams" can refer to the primary players or groups of a team in sports or other fields. However, there are several synonyms that can also be used to describe these individuals or groups. These synonyms include "main squad," "top performers," "leading team," "starting lineup," "key players," "champions," "elite team," "front line," "primary squad," and "best team." Each of these phrases conveys the same idea of the best or most important players or groups within a team. By using these synonyms, writers can add variety to their descriptions and make their writing more engaging for the reader.