How to Pluralize With '-S' and '-ES' | Merriam-Webster
www.merriam-webster.com › words-at-play › how-to-useThe most basic rule is to pluralize a noun by adding the suffix -s (as in voters); however, if the noun ends in -s, -x, -z, -sh, or -ch (with the exception—see, we already have an exception—of words ending in -ch pronounced with a hard k, like monarchs and stomachs), the suffix -es is added in order to create an extra syllable to pronounce the plural—as in goddesses, anticlimaxes, blitzes, flashes, and torches. That's pretty easy to apply in one's writing, but not all nouns follow the ...