The word 
is not a valid scrabble word
2 short excerpts of WikWik.org (WikWik is an online database of words defined in the English, French, Spanish, Italian, and other Wiktionnaries.)
- back␣substitution n. (Linear algebra) A method of solving linear systems that have been transformed into row echelon form.
- back␣substitution n. (Combinatorics) A method of solving recurrence relations.
17 valid words from 2 definitions
ALGEBRA BEEN COMBINATORICS ECHELON FORM HAVE INTO LINEAR METHOD OF RECURRENCE RELATIONS ROW SOLVING SYSTEMS THAT TRANSFORMED
16 words-in-word (Words found as is inside the word.)
BA BAC BACK BACKS IO ION IT ON ST SUB SUBS SUBSTITUTION TI TIT TUT UT
14 words-in-word RTL (Words found written from right to left, inside the word.)
AB BUS BUSK CAB IT ITS NO OI TI TIT TITS TUT US UT
Scrabble scoring
- Zero, invalid.
- 26 points, without game rules.
Other languages
Categories without words
- No anagrams (Word found by changing the order of the letters.)
- No cousins (Word found by changing only one letter.)
- No lipograms (Word found when removing only one letter.)
- No epentheses (Word found when adding only one letter.)
- No suffixes (Word found by adding one or more letters at the end of the word.)
- Not found in the middle (Word found by adding letters in front and at the end of the word.)
- No prefixes (Word found by adding one or more letters in front of the word.)
- No anagrams can be formed with an extra letter (New word formed with all the letters of the word and an extra letter.)
- No anagrams can be formed by removing a letter (New word formed with all the letters of the word minus a letter.)
Scrabble words — in black are valid world wide — in RED are not valid in North America — in GREEN are valid only in North America.
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