Mini and Many are easily confused words.
The spell-check application of most word processing software programs would not catch a slip-up of these two words. Spell-check is looking for words that aren’t in its dictionary, and words that resemble words in its dictionary but are possibly spelled wrong. Spell-check isn’t perfect. It doesn’t know and can’t guess what word you wanted or what word you meant, it can only judge the words on the page. If you used words that are all spelled correctly, it gives you a pass anyway.
Autocorrect suggests words that start with the same letters. It suggests what word you may want to save time, but quite often, its suggestions couldn’t be more off base and produces humorous results.
Mini is an adjective. It means very small or tiny relative to a similar object, and it is short for miniature. For example, toddler and children’s clothes are “mini” versions of adult styles.
Many is also an adjective. It means a large grouping or collection of something, whether it’s ideas, people, or objects.
The following sentence uses both words correctly:
Minka was an avid collector of dollhouse furniture, including mini versions of those regular size pieces which fit perfectly into a dollhouse’s dollhouse.