Letters that make double-barreled
a, o, b, d, e, l, r, u are letters that make 'double-barreled'
Words within double-barreled
el, LED, BA, DO, do, re, Ba, ar, ED, EL, barreled, double, bar, barrel, BAR, AR, Re, LE, Ar are words within 'double-barreled'