Is ‘therein’ a Scrabble US Word? Yes
Is ‘therein’ a Scrabble UK Word? Yes
Is ‘therein’ a Words With Friends Word? Yes
Is ‘therein’ an Adjective? No
Is ‘therein’ an Adverb? Yes
Is ‘therein’ a Noun? No
Is ‘therein’ a Verb? No
(formal) in or into that thing or place;
"they can read therein what our plans are"

See also: Words That Rhyme With THEREIN →