Yes, fiber is in the scrabble dictionary

...and is worth 11 points by itself.

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Fiber Definition

noun

A natural or synthetic filament, as of cotton or nylon, capable of being spun into yarn.
from The American Heritage Dictionary of the English Language, 4th Edition
A slender, elongated, threadlike object or structure.
from The American Heritage Dictionary of the English Language, 4th Edition
Anatomy Any of the filaments constituting the extracellular matrix of connective tissue.
from The American Heritage Dictionary of the English Language, 4th Edition
Anatomy Any of various elongated cells or threadlike structures, especially a muscle fiber or a nerve fiber.
from The American Heritage Dictionary of the English Language, 4th Edition
Basic strength or toughness; fortitude: lacking in moral fiber.
from The American Heritage Dictionary of the English Language, 4th Edition

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Top Words by points

Points

fibre

10

2 letter words with FIBER

Points

bi

4

be

4

re

2

ef

5

er

2

fe

5

if

5

3 letter words with FIBER

Points

reb

5

ire

3

ref

6

rei

3

rib

5

fir

6

fie

6

fib

8

fer

6

rif

6

4 letter words with FIBER

Points

reif

7

rife

7

fire

7

brie

6

bier

6

5 letter words with FIBER

Points

fibre

10

fiber

10

brief

10

Found 25 words in 0.12937 seconds