Pope pays John Moore a compliment that turns out to be an insult, and then a death sentence. Moore is addressed as the maker of a "Celebrated Worm-Powder", a remedy for the worms that live inside the human gut. Pope takes that humble product and stretches the idea until it covers the whole human race: "All humankind are worms." The opening word "egregious" sets the tone. Its older meaning was "outstanding", but a modern reader hears the sneer too, and the poem seems to enjoy both senses at once.
Most of the poem is a game of definitions. Pope runs through the social types of his world and gives each one a worm of its own. Scholars are "book-worms", the dull are "slow-worms", the flatterer is an "earwig", the miser a "muck-worm", the dandy a "silk-worm". The best joke is "death-watches, physicians". A death-watch is a ticking insect that was taken as an omen of dying, so Pope hints that doctors are creatures who hover around the dying. Some of the puns have a sly edge. The "nymph whose tail is all on flame" is a glow-worm, and judging by the phrasing, the line is also a bawdy dig at women. The "fops" are butterflies, which "first from a worm they take their rise, / And in a worm decay". That image holds the whole life cycle in two lines and quietly foreshadows the poem's ending.
The form suits the joke. Each stanza is a quatrain that alternates longer and shorter lines (roughly eight syllables, then six) and rhymes abab. It is the bouncing rhythm of a ballad or hymn, which makes the subject sound innocent. Pope also enjoys rhymes that are almost too neat: "slow-worm" with "glow-worm", "conditions" with "physicians". The doubled endings land like punchlines, and the reader can almost hear the groan and the grin. The stanza about Eve works the same way, because "evil" and "Devil" are made to rhyme, and the Devil is called "that ancient worm". Behind that phrase is the old sense of "worm" as serpent, so the joke leads back to the Garden of Eden.
Around the seventh stanza the tone darkens. Statesmen are worms because of their "winding play", which describes their crooked politics and also the way a worm moves. Then the image turns inward: "Their conscience is a worm within, / That gnaws them night and day." The comic worm becomes a moral one. In the next stanza Pope asks Moore to cure the courtier of "The worm that never dies", an echo of the Bible's language about damnation. Here Moore's powder is judged against a remedy no apothecary could supply. The verb "void" is also a good choice. It makes a medical joke about purging the body and a moral point about expelling guilt.
The ending turns on Moore himself. The poem places him in "Abchurch Lane" and calls him a "learnèd friend", and then it takes the compliment back: "Vain is thy art, thy powder vain, / Since worms shall eat even thee." This is the traditional *memento mori*, the reminder that everyone dies, delivered in the form of an advertisement. The legal word "adjourn" makes death a case that can be postponed for "some few short years" but never dismissed. The final stanza adds a last jab at "Button's Wits", presumably the fashionable writers of a coffee house of that name. They will "to worms turn, / Who maggots were before". "Maggot" also meant a silly whim in the language of the time, so Pope may be mocking their ideas as well as their bodies.
The poem matters because it shows how much a light occasion can carry when the writer is sharp enough. Pope never drops the joking, and he still reaches an old and serious truth about vanity, ambition, and the body. Social satire, theology, and medical humour all fit inside forty lines of nursery-bright verse. The laugh comes first and the chill arrives a few lines later, which is why the poem sticks in the memory.