47 43 41 + 1 = 42 bytes
-4 bytes thanks to @Sunny Pun. -2 bytes thanks to @Brad Gilbert b2gills and @Downgoat
Run with the
It can definitely be golfed futher, but in the spirit of competition, I'm leaving the mostly-original regex I came up with at the beginning.
Returns nothing if true,
1 if false.
I downloaded a dictionary file, and the longest word I found was 11 letters --