Yes, host is in the scrabble dictionary

...and is worth 6 points by itself.

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Host Definition

noun

A great number; a multitude. See Synonyms at multitude.
from The American Heritage Dictionary of the English Language, 4th Edition
A person who manages an inn or hotel.
from The American Heritage Dictionary of the English Language, 4th Edition
An army.
from The American Heritage Dictionary of the English Language, 4th Edition
Biology The animal or plant on which or in which another organism lives.
from The American Heritage Dictionary of the English Language, 4th Edition
Computer Science A computer containing data or programs that another computer can access by means of a network or modem.
from The American Heritage Dictionary of the English Language, 4th Edition

verb-transitive

Usage Problem To serve as host to or at: "the garden party he had hosted last spring” ( Saturday Review).
from The American Heritage Dictionary of the English Language, 4th Edition

verb

To assemble in a host usually for a purpose.
from Free Scrabble Dictionary
To serve as host to, at, or for.
from Free Scrabble Dictionary
Act as host at (an event) or for (a television or radio programme).
from Free Scrabble Dictionary
Store (a website or other data) on a server or other computer so that it can be accessed over the Internet.
from Free Scrabble Dictionary

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Top Words by points

Points

shot

7

2 letter words with HOST

Points

ho

5

to

2

oh

5

os

2

sh

5

so

2

3 letter words with HOST

Points

hot

6

tho

6

sot

3

soh

6

sho

6

ohs

6

4 letter words with HOST

Points

shot

7

soth

7

hots

7

host

7

tosh

7

Found 17 words in 0.11405 seconds