thumb is a valid English word

Scrabble validity: valid ( international - Sowpods, US - Twl06 )
iScramble validity: valid
QuickWords validity: valid

Meanings

Noun (COUNTABLE)

The short thick digit of the hand that for humans has the most mobility and can be made to oppose (moved to touch) all of the other fingers.
(GUI) The part of a slider that may be moved linearly along the slider.
• a scroll-bar thumb
(colloquial Internet) A thumbnail picture.

Verb

(transitive) To touch or cover with the thumb.
• to thumb the touch-hole of a cannon
(transitive with through) To turn the pages of (a book) in order to read it cursorily.
• I thumbed through the book and decided not to bother reading it all.
(travel) To hitchhike
• So I started thumbin' back east, toward my hometown.

thumb is a Scrabble valid word

thumb

• International English (Sowpods) - The word is valid in Scrabble ✔
• US English (TWL06) - The word is valid in Scrabble ✔
• 00 points

thumb is an iScramble, QuickWords valid word

thumb

• The word is valid in iScramble ✔
• The word is valid in QuickWords ✔
• 00 points

Same letters words (Anagrams)

• none

Same letters plus one

• THEMBU
• THIMBU
• THRUMB
• THUMBS
• THUMBY

Same letters minus one

• BHUT
• BMTH
• BUTH
• MUTH
• THUM
• TUMB