overspecialise, overspecialize.
specialised, specialiser, specialism, specialist, specialize.
specialised, specialises, specialties, specializes.
Your query has returned 347 words, which include anagrams of specialise as well as other shorter words that can be made using the letters included in specialise.
The words in this list can be used in games such as Scrabble, Words with Friends, Wordscapes and other similar games.