Fill words: the short answers that appear in almost every puzzle
ETUI, OLEO, ESNE and forty more. Why grids need these short words, how they are clued, and the fastest way to learn them.
Open twenty crosswords and you will meet the same short words again and again. ETUI, OLEO, ESNE, OREO, ALOE. Solvers call them crosswordese or fill, and they are not a failure of imagination. They are the price of building a grid where every letter has to work in two directions at once. Learning forty of them is the single fastest improvement available to a new solver.
Why the same short answers repeat
A fully checked American grid has no spare squares. Every letter a setter places in a three or four letter slot must also serve a crossing entry, and the crossing entry may already be fixed by a themed answer above it. The words that survive those constraints are short, alternate vowels and consonants, and begin or end with the letters that cross most easily: A, E, I, O, R, S, T, L, N.
That is why a word like ETUI, which almost nobody says aloud, earns its place. Vowel, consonant, vowel, vowel is a shape that rescues corners. British lattice grids need fill less often, because unchecked squares give the setter room, which is one reason crosswordese feels more American than British.
Crosswordese is not vocabulary. It is a set of keys, and the only question that matters is whether the key turns.
The core vocabulary
These recur constantly. The third column gives the angle a clue is likely to take, which matters more than the dictionary definition.
| Answer | Meaning | Clue angle to expect |
|---|---|---|
| OREO | Sandwich cookie | Cookie, black and white snack, twist and dunk |
| ETUI | Small case for needles or pins | Sewing kit holder, little case |
| OLEO | Margarine | Butter substitute, spread |
| ALOE | Soothing succulent | Burn soother, lotion additive, gel source |
| ERA | Period of time | Historical stretch, baseball statistic |
| ESNE | Anglo-Saxon labourer | Old serf, feudal worker |
| EPEE | Fencing blade | Olympic weapon, foil relative |
| ARIA | Solo in an opera | Diva's number, operatic solo |
| ANTE | Poker stake | Pot starter, pre-deal chip, raise it |
| ELAN | Dash or verve | Style, flair, panache |
| ORCA | Killer whale | Marine park performer, black and white swimmer |
| EDAM | Dutch cheese | Waxed round, cheese from Holland |
| ERIE | One of the Great Lakes | Lake or canal, Buffalo's water |
| ISLE | Small island | Land in the sea, Man or Wight |
| ODEA | Concert halls, plural of odeum | Ancient theatres |
| ASEA | On the water | Out sailing, adrift |
A longer list organised by letter pattern rather than by meaning is kept in common answer patterns for four letter slots, which is worth reading once you recognise most of the table above.
How fill is clued
Editors know these words are familiar, so they vary the clue rather than the answer. ERA can be defined as a span of history, as a geological period, or through the baseball earned run average, which is why it often carries an abbreviation flag. ALOE arrives as a plant, as an ingredient in a lotion, or through vera. OREO is clued straight on Monday and obliquely later in the week, sometimes with a question mark to signal a pun.
The practical move is to read fill clues in reverse. Instead of asking what the clue means, ask which short word you already know that could be clued this way. With _ L O E in place, the answer is ALOE and the clue can be checked afterwards.
Learning them efficiently
- Keep a single running list. Every time a short answer surprises you, add it with its length and one clue angle.
- Group by pattern, not alphabetically. Words matching
E _ _ Eor_ _ E Ashould sit together. - Review the list before you start a puzzle, not after. Ten seconds of priming beats an hour of regret.
- Stop at about forty entries. The long tail is not worth memorising, and crossings will supply it.
Definitions for the genuinely obscure entries are worth confirming in a real dictionary rather than a word list, because the definition tells you which clue angles are legal. Merriam-Webster and Collins both carry ETUI and ESNE. If you want to see how often a given entry has actually appeared in a major daily, the archives at XWord Info count occurrences puzzle by puzzle, and a curated directory of crossword reference sites collects the other lookup tools in one place.
Terms used here, including fill, crosswordese and checked square, are defined in the glossary. If a short slot is still blocking a corner, the recovery routine in when you stall is the next thing to try.
When you stall: a repeatable order of attack. What to do with a half finished grid that has stopped moving.
One clue technique, every Sunday
A short email with one device, three worked examples, and a puzzle to try.