false friend
From Longman Dictionary of Contemporary Englishfalse friendˌfalse ˈfriend noun [countable] 1 a word in a foreign language that is similar to one in your own, so that you wrongly think they both mean the same thing2 someone who seems to be your friend but is notExamples from the Corpusfalse friend• We feel sympathy for the hero who is led astray under the influence of his false friend.