Oliver Cowdery first wrote the singular word (although orthographically he made the mistake of writing an m instead of a w); then virtually immediately he corrected word to the plural words (the level of ink flow is unchanged). Two preceding occurrences of “recall (all) the words” in this discourse support the plural reading:
Summary: Maintain in Mosiah 17:10 the plural words, Oliver Cowdery’s virtually immediate correction in 𝓟; this reading is also consistent with two previous references to Abinadi and whether he would recall his words.