a feminine equivalent of -ster: seamstress; songstress.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
British Dictionary definitions for -stress
suffix forming nouns
indicating a woman who performs or is engaged in a certain activitysongstress; seamstress Compare -ster (def. 1)
Word Origin for -stress
from -st (e) r + -ess
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012