What is a Check Word?

Question

_{This is in the spirit of the What is a Word/Phrase™ series started by JLee with a special brand of Phrase™ and Word™ puzzles.}

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If a word conforms to a special rule, I call it a Check Word™.
Use the following examples below to find the rule.

Check Words™	Not Check Words™
CRY	SMILE
BMW	MERCEDES
THOSE	THEM
CRLF	NEWLINE
STOUT	LAGER
DONUT	BAGEL
HOUND	DOG
SHADE	SHADY

Update / Hint:

Check Words™ are so-named because of a certain person of "Check" heritage.

And, if you want to analyze, here is a CSV version:

Check Words™,Not Check Words™
CRY,SMILE
BMW,MERCEDES
THOSE,THEM
CRLF,NEWLINE
STOUT,LAGER
DONUT,BAGEL
HOUND,DOG
SHADE,SHADY

Answer 1

I think a Check Word is a word that

can be typed on only one row of the Dvorak keyboard layout.

They are called Check Words because

Check sounds like Czech, which is the nationality of the composer Dvorak