isograms
No repeated letters
Isograms are words in which no letter repeats.
Common examples include *ambidextrously* and *uncopyrightable*—prized by word-game enthusiasts for their length.
The term also applies to lines on maps connecting points of equal value, such as temperature or pressure, though *isoline* or specific terms like *isobar* are more common in that sense.
Occurring only once
- wordplayVerbal wit techniques
- pangramAll-letter sentence
- alphabetLanguage's letter system
- orthographyStandard writing conventions
spelling · constraint · word game · cryptogram · vocabulary · lexicon · typography · word structure
Ineligible for intellectual protection
- ambidextrouslyWith equal hand facility
- troublemakingDeliberately causing discord
- downstreamAlong the current's path
- algorithmsFinite instruction sequences
palindrome · thunderclaps · fingerprints · documentary · speculation · Switzerland · background · outspread
Daily five-letter puzzle
- word gameLanguage-based entertainment
- crosswordClue-based letter grid
- ScrabbleTile-based word game
- letter puzzleWord-forming challenge
brain teaser · cipher · code breaking · riddle · quiz · challenge · pattern recognition · deduction
Bounding line of shape
- elevationHeight above reference point
- topographyPhysical feature mapping
- mappingDiagram of correspondences
- gradientRate of change across space
terrain · cartography · geographic · altitude · meteorology · equal value · surveying · relief map
nonrepeating
Occurring only once
orthography · spelling · constraint · word game · cryptogram · vocabulary · lexicon · typography · word structure · phonology
uncopyrightable
Ineligible for intellectual protection
- ambidextrouslyWith equal hand facility
- troublemakingDeliberately causing discord
- downstreamAlong the current's path
algorithms · palindrome · thunderclaps · fingerprints · documentary · speculation · Switzerland · background · outspread · birthname
Wordle
Daily five-letter puzzle
letter puzzle · brain teaser · cipher · code breaking · riddle · quiz · challenge · pattern recognition · deduction · logic puzzle
contour
Bounding line of shape
- elevationHeight above reference point
- topographyPhysical feature mapping
- mappingDiagram of correspondences
gradient · terrain · cartography · geographic · altitude · meteorology · equal value · surveying · relief map · chart