Yes, infest is in the scrabble dictionary

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Infest Definition

verb-transitive

To inhabit or overrun in numbers or quantities large enough to be harmful, threatening, or obnoxious: rats infesting the sewers; streets that were infested with drugs.
from The American Heritage Dictionary of the English Language, 4th Edition
To live as a parasite in or on: livestock that were infested with tapeworms.
from The American Heritage Dictionary of the English Language, 4th Edition

verb

To spread or swarm in or over in a troublesome manner .
from Free Scrabble Dictionary
To live in or on as a parasite.
from Free Scrabble Dictionary

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Top Words by points

Points

infest

9

2 letter words with INFEST

Points

en

2

if

5

in

2

is

2

it

2

ne

2

ef

5

si

2

te

2

ti

2

es

2

et

2

fe

5

3 letter words with INFEST

Points

tie

3

net

3

tis

3

ifs

6

ins

3

its

3

tin

3

nit

3

tes

3

sei

3

sen

3

set

3

sin

3

sit

3

ten

3

eft

6

fen

6

fes

6

est

3

fet

6

fie

6

fin

6

fit

6

ens

3

efs

6

4 letter words with INFEST

Points

fets

7

tins

4

efts

7

tine

4

snit

4

site

4

sine

4

sift

7

sent

4

seif

7

ties

4

fits

7

fist

7

tens

4

fens

7

fest

7

tein

4

fins

7

nits

4

nite

4

nets

4

nest

4

neif

7

fine

7

5 letter words with INFEST

Points

tines

5

teins

5

stein

5

senti

5

nites

5

neist

5

neifs

8

inset

5

feint

8

feist

8

fines

8

6 letter words with INFEST

Points

infest

9

feints

9

finest

9

Found 76 words in 0.16686 seconds