Letters that make arcs
s, a, c, r
are letters that make 'arcs'
Words within arcs
arc, ar, AR, Ar, Cs
are words within 'arcs'
Anagrams of arcs
scar, cars
are anagrams of 'arcs'
Words created by adding a letter to the beginning or end of arcs
narcs, marcs
are words created by adding a letter to 'arcs'