Yes, hashtag is in the scrabble dictionary

...and is worth 13 points by itself.

find more words you can make below

Hashtag Definition

noun

A tag embedded in a message posted on the Twitter microblogging service, consisting of a word within the message prefixed with a hash sign.
from the English-language Wiktionary

Find More Words!

Wildcard(?) letters appear in RED

Here are some other words you could make with the letters HASHTAG, you can also
use this lookup tool to help you find words with our scrabble word finder.

Top Words by points

Points

hashtag

14

2 letter words with HASHTAG

Points

ag

3

ta

2

sh

5

ha

5

at

2

aa

2

ah

5

as

2

3 letter words with HASHTAG

Points

aah

6

tas

3

tag

4

shh

9

sha

6

sat

3

sag

4

hat

6

has

6

hah

9

hag

7

gat

4

aas

3

aga

4

ags

4

gas

4

ats

3

ash

6

aha

6

ahs

6

4 letter words with HASHTAG

Points

shag

8

hats

7

aahs

7

saga

5

hath

10

shah

10

stag

5

tags

5

agha

8

gash

8

gast

5

gats

5

ghat

8

hast

7

agas

5

hags

8

haha

10

hahs

10

hash

10

5 letter words with HASHTAG

Points

aghas

9

ghats

9

ghast

9

hahas

11

6 letter words with HASHTAG

Points

aghast

10

7 letter words with HASHTAG

Points

hashtag

14

Found 53 words in 0.25493 seconds