sprzymierzeców
Sprzymierzeców is not a standard or widely used Polish word. In contemporary Polish, the plural genitive form of the noun meaning ally is sprzymierzeńców; sprzymierzeców is typically regarded as an archaic, dialectal, or nonstandard variant and is rarely encountered in modern texts. Because of this, sprzymierzeców is usually treated as a misspelling or an older orthographic form rather than a separate lexical item.
The base noun for allies is sprzymierzeniec, from which the common modern forms sprzymierzeńca (genitive singular),
In usage, Polish speakers and writers use sprzymierzeńcy and its inflected forms to denote allies or coalition
See also: sprzymierzeniec, sprzymierzeńcy, sprzymierzeńców, sojusz.