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There is only one four-letter word beginning with UMBO

UMBOumbo n. (Historical) The boss of a shield, at or near the middle and usually projecting, sometimes in a sharp spike.
umbo n. (Biology) A boss, or rounded elevation, or a corresponding depression, in a palate, disk, or membrane.
UMBO n. (Latin) the rounded elevation at the centre of a shield.

Scrabble words — in black are valid world wide — in RED are not valid in North America — in GREEN are valid only in North America.
Definitions are short excerpt from the WikWik.org and 1Word.ws.

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See this list for:

  • English Wiktionary: 1 word
  • Scrabble in French: 1 word
  • Scrabble in Spanish: no word
  • Scrabble in Italian: no word
  • Scrabble in German: no word
  • Scrabble in Romanian: no word


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