backwash, brainwash, gouache, goulash, hogwash, mouthwash, whitewash, whitewash.
Your query has returned 603 words, which include anagrams of mackintosh as well as other shorter words that can be made using the letters included in mackintosh.
The words in this list can be used in games such as Scrabble, Words with Friends, Wordscapes and other similar games.