Letters that make rubs
s, b, r, u
are letters that make 'rubs'
Words within rubs
BS, rub, Ru
are words within 'rubs'
Anagrams of rubs
burs, urbs
are anagrams of 'rubs'
Words created by adding a letter to the beginning or end of rubs
drubs, grubs
are words created by adding a letter to 'rubs'