1. List the unique letters:
* i
* n
* t
* r
* o
* d
* u
* e
* s
2. Start brainstorming:
* One-letter words: i, a, o, u
* Two-letter words: in, it, is, on, no, do, us,
* Three-letter words: tin, ton, run, son, due, end,
* Four-letter words: into,
* Five-letter words: intro,
* Six-letter words:
* Seven-letter words:
Total: There are at least 21 smaller words that can be made from the letters in "introduced". This isn't exhaustive, and there might be more depending on whether you include proper nouns or less common words.