# Seeking lists of words formed from an existing word

Where is a resource that lists words that can become another word with the addition of one letter while still maintaining the order of the letters? For example, adding an "I" to SLANDER creates the word ISLANDER. FRIGHT becomes FREIGHT.

I have found a variety of websites but they only offer 3-5 letter words. I'm looking for more challenging words.

You can use Qat with a query like

AB;A.B;|A|=0-;|AB|=7


Explanation:

A and B are by default non-empty strings.

AB


The concatenation of A and B forms a word.

A.B


The concatenation of A, any letter, and B forms a word.

|A|=0-


The length of A is at least 0. This allows A to be empty. I haven't allowed B to be empty to forbid simple one-letter suffix additions like s, d, or r.

|AB|=7-


The total length of A and B is at least 7.

• What a neat site! A;A[!sdr];|A|=7- finds one-letter suffix additions, excluding s,d,r. Some fun ones are flamingO, crotchetY, directorY, and harmonicA. Mar 20 at 17:49