Yes, roost is in the scrabble dictionary

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Roost Definition

noun

A perch on which domestic fowl or other birds rest or sleep.
from The American Heritage Dictionary of the English Language, 4th Edition
A place for temporary rest or sleep.
from The American Heritage Dictionary of the English Language, 4th Edition
A place with perches for fowl or other birds.
from The American Heritage Dictionary of the English Language, 4th Edition
A group of birds together.
from Free Scrabble Dictionary
A support on which birds rest.
from Free Scrabble Dictionary

idiom

Come home to roost To have repercussions or aftereffects, especially unfavorable ones: The consequences of your mistake will eventually come home to roost.
from The American Heritage Dictionary of the English Language, 4th Edition
Rule the roost Informal To be in charge; dominate: In this house my parents rule the roost.
from The American Heritage Dictionary of the English Language, 4th Edition

verb-intransitive

To rest or sleep on or as if on a perch or roost.
from The American Heritage Dictionary of the English Language, 4th Edition

verb

To settle oneself as if on a roost.
from Free Scrabble Dictionary
To supply a roost for or put to roost.
from Free Scrabble Dictionary
To settle down for rest or sleep .
from Free Scrabble Dictionary

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Top Words by points

Points

toros

5

2 letter words with ROOST

Points

os

2

to

2

or

2

so

2

3 letter words with ROOST

Points

oot

3

ors

3

ort

3

tor

3

too

3

roo

3

rot

3

sot

3

4 letter words with ROOST

Points

toro

4

sort

4

soot

4

tors

4

rots

4

roto

4

root

4

roos

4

orts

4

oots

4

5 letter words with ROOST

Points

toros

5

torso

5

rotos

5

roots

5

roost

5

Found 27 words in 1.08387 seconds