Letters that make tis
s, t, i
are letters that make 'tis'
Words within tis
ti, Ti, is
are words within 'tis'
Anagrams of tis
sit, its
are anagrams of 'tis'
Words created by adding a letter to the beginning or end of tis
NTIS, Otis
are words created by adding a letter to 'tis'