actinide, allied, amide, apartheid, arsenide, backside, backslide, beatified, bedside, blindside, broadside, bromide, burnside, carbide, certified, citywide, classified, cockeyed, codified, countrywide.
Your query has returned 1707 words, which include anagrams of countrysides as well as other shorter words that can be made using the letters included in countrysides.
The words in this list can be used in games such as Scrabble, Words with Friends, Wordscapes and other similar games.