Word Ladder Solver

A word ladder connects two words of the same length by changing one letter at a time, with every rung a listed word. Enter a start and target word (3-7 letters) to get the shortest ladder plus alternatives, fill a missing middle rung, or explore any word's one-letter neighbors.

Letters A–Z only, 3–7 letters. Both words must be the same length.

About the Word Ladder Solver

The solver walks a fixed word-ladder graph compiled for this data build. Two words are connected when they have the same length and differ by exactly one letter substitution; every rung on a returned ladder is a word from that graph. The shortest ladder is found by breadth-first search, so no shorter ladder exists within the graph, and up to three alternative ladders of the same length are listed when they exist.

When no ladder connects two words, the solver explains why: it explores each word's reachable island of the graph (up to a fixed exploration budget) and names the island words that come closest to the other end, measured by differing letter positions.

Data sources and bounds

  • The graph covers words of 3–7 letters spelled with plain letters a–z, drawn from this build's compiled lexicon of pinned source lists. Membership means presence in those source lists, not validity in any particular game.
  • Only words in commonness tiers 1–3 — a build-specific ranking band, not a universal usage claim — are graph vertices, so rare or single-source spellings never appear as rungs.
  • Edges are one-letter substitutions only; insertions and deletions are not part of this graph, so words of different lengths never connect.
  • Words on this build's content-policy exclusion list are removed from the graph and from every displayed result.
  • Short glosses shown beside rungs come from this project's generated definitions corpus and are informational summaries, not authoritative dictionary entries. Some words have no stored gloss.
  • No-path island sizes are floors when marked as truncated: exploration stops at a fixed node budget.
  • Ladders are computed within a step budget of 12 substitutions; connected pairs beyond that budget are reported as such rather than solved.

Results reflect data version v1/2026.07-lexical.6; the word set and graph can change between builds.