One day, Professor Ramarajan decided to test the intelligence of his students.
He randomly chose 3 students from the class as volunteers. He then went and wrote 6 words on the blackboard.
Each one of them was told a different letter from one of the words written on the board.
He then cleared his throat and said, "None of you can tell me hoe many vowels the word has."
He then said, "Even now, none of you can tell me how many vowels the word has."
The smartest of the 3 boys immediately declared that he knows the word.
Identify the word. Also, provide a detailed explanation along with your answer.