Is ‘thereby’ a Scrabble US Word? Yes
Is ‘thereby’ a Scrabble UK Word? Yes
Is ‘thereby’ a Words With Friends Word? Yes
Is ‘thereby’ an Adjective? No
Is ‘thereby’ an Adverb? Yes
Is ‘thereby’ a Noun? No
Is ‘thereby’ a Verb? No
by that means or because of that;
"He knocked over the red wine, thereby ruining the table cloth"

See also: Words That Rhyme With THEREBY →