Yes, liar is in the scrabble dictionary

...and is worth 5 points by itself.

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Liar Definition

noun

One that tells lies.

from The American Heritage Dictionary of the English Language, 4th Edition

A person who tells lies.

from Free Scrabble Dictionary

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Here are some other words you could make with the letters LIAR, you can also
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Top Words by points	Points
aril	4

2 letter words with LIAR	Points
al	2
ar	2
ai	2
la	2
li	2

3 letter words with LIAR	Points
lar	3
ria	3
rai	3
air	3
ail	3

4 letter words with LIAR	Points
aril	4
lair	4
lari	4
liar	4
lira	4
rail	4
rial	4

Found 17 words in 0.14124 seconds