"confounds" in the verb sense
1. confuse, throw, fox, befuddle, fuddle, bedevil, confound, discombobulate
be confusing or perplexing to cause to be unable to think clearly
"These questions confuse even the experts"
"This question completely threw me"
"This question befuddled even the teacher"
2. confuse, confound
mistake one thing for another
"you are confusing me with the other candidate"
"I mistook her for the secretary"
Source: WordNet® (An amazing lexical database of English)
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