car - nt

In US English, "can" and "can't" have the same short vowel sound. Pretty logical. In UK English, "can't" has a long vowel sound. Keep the vowel long and it will never be mistaken for a swear word.

If you are in North America, most of the time you will hear Кент Если ты говориш в Англии ты будеш говорить Кант It sounds more nasalized in UK English

As I know, in american english it is said kant and in british eng. it is said kent.

For U.S. English, the pronunciation for "can't" is [kænt] and for "can" is [kǝn]. (I'm using the international phonetic alphabet to write the pronunciation.) It's very important for ESL students to learn how to say the [æ] in "can't." Otherwise, Americans hear the word as "can." That's the real problem for my students (and not that other word you mentioned; LOL).