Defend your base by labelling each marching word with its correct part of speech before it breaks through.
Words advance down four lanes toward your base. Aim at a lane, then fire the turret matching the front-most word's part of speech, noun, verb, adjective, adverb and more. A correct tag neutralises the word. When a word could belong to more than one category, a sentence appears so you can judge it in context. Any word that reaches the base costs a life.
Speech City turns parts-of-speech practice into a lane-based tower defense, where correctly classifying words is how you hold the line.
Tagging each word by its part of speech is the first classification English grammar teaches.
The original wrinkle is stated outright: a word may belong to more than one category.
That ambiguity is not an edge case, it is the normal condition of English. Run, light and fast are several parts of speech each, and which one applies is decided by the sentence rather than the word — so a tagger that works word by word is guaranteed to fail.
Speech City is an original free browser game built for PlayPendium that turns parts-of-speech practice into a lane-based tower defense. Free to play, no sign-up required.