You have to be able to differentiate between these words.
But not only by the ear, study them using the buttons and Praat, record your imitation and let yourself decide when you say it.

• Select the box next to "Keep" so that the words are maintained by the number of times you select in the box next to it.
• With the buttons orange you can hear the pronunciation of the associated word.
• With the buttons You can watch videos from YouGlish.com that contain the word. Remember the facilities that it offers.
• With links to dictionaries you can verify the word.