The first four are because I copied it from Wordle's list, which doesn't have plurals, and I kinda want to keep it that way. but Prise is a good one to add! probably the NYT removed british spellings?
Ah, I had no idea that U.S. spells prise with a "z"! But surely SINGS/SEEDS/SPIES are present tense verbs as well as plural nouns? If you're going to keep an intentionally-restricted dictionary, perhaps it might be interesting to have it _only_ populated with singular nouns? That way it feels like each step is a transformation between objects rather than words?