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 The word  is in the Wiktionary1 short excerpt of Wiktionnary (A collaborative project to produce a free-content dictionary.)— English word —substack n. (Mathematics) A subset of a stack.
 4 English words from the English definitionMathematics of␣a stack subset One suffix (New word found by adding one or more letters at the end of the word.)substacks 20 words-in-word (Words found as is inside the word. Minimum size 3 letters.)ack ACK BST sta Sta STA Sta. stack Stack sub sub- sub. subs subst. tac TAC tack Tack UBs UBS 17 words-in-word RTL (Words found written from right to left, inside the word. Minimum size 3 letters.)ats ATs ATS at's ATSB bus 'bus bus. Bus. cat Cat CAT cats Cats CATs SBU TSB 2 anagrams (New words found by changing the order of the letters.)sackbuts subtacks 9 anagrams found with an extra letter (New words formed with all the letters from the word and an extra letter.)buckstays fast␣bucks sackbutts slacktubs slack-tubs slack␣tubs Starbucks substacks subtracks 5 anagrams found minus a letter (New words formed with all the letters from the word minus a letter.)sacbuts sackbut subacts subtack subtask One lipogram (New word found when removing only one letter.)subtack 
 
 
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