Yest is valid Scrabble Word

Is yest a scrabble word?
Official Scrabble Players Dictionary NO
Official Tournament and Club Word List NO
Collins Scrabble Words YES
Is yest valid Words with Friends?
Words with Friends NO

4 letters word
7 points in Scrabble
6 points in WWF

Definitions for YEST in dictionary:

NOUN:

(obsolete) yeast
See Yeast.

OTHER DEFINITIONS:

archaic form ofyeast

Words related to YEST

yeast8 yests8

How to use YEST in a sentence

And, after all, I wanted a mill to grind it, sieve to dress it, yest and salt to make it into bread, and an oven to bake it.
Then let it cool till it be Lukewarm, at which time put some Ale yest into it, to make it work, as you would do Ale.
I am told that the Leaven of bread will make it work as well as yest, but I have not tryed it.
In the mean time make the great quantity of Liquor work with yest.
Then clarifie it with whites of Eggs and their shells, and make it work with yest.
Then take it off, and set it a working at such heat as you set Beer, with good yest.
As soon as you find it so, let it run through a strainer, to leave behind all the exhausted currants and the yest, and so bottle it up.
Boil it well, when you come to work it with yest, take very good Beer-yest, not Ale-yest.
When you mingle your yest and Eggs together for the Cake, put Musk and Amber to that.

Find what other words can be done using letters: "yest"
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