Letters that make hierarchical
a, e, l, c, h, r, i are letters that make 'hierarchical'
Words within hierarchical
ER, IE, hi, ERA, IC, arc, chi, ar, hie, chic, hierarchic, arch, ic, ie, RA, AL, AR, CA, HI, Ra, hierarch, Al, Ar, Ca, Er, era are words within 'hierarchical'