That is the correct US plural spelling "hors d'oeuvres" from the French hors d'œuvres (which is singular or plural)
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un hors-d'oeuvre, pl. "des hors-d'oeuvres" OR "des "hors-d'oeuvre" In multiple part words, verbs, adverbs and prepositions do not change. Nouns can take the plural mark, or not depending of the sense...
hors· d'oeuvre (pronounced or-DURV) is a noun. A small portion of a tasty food served as an appetizer before a meal or as at a cocktail party. From the French, and literally means "outside of work"...