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 already say it.
Select the "Consonants" or "Vowels" buttons.
In the box below select the sound you want to master.
In the box next to it select the other sound.
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 orange buttons you can hear the pronunciations of the associated word.
With the buttons you can watch videos from YouGlish.com that contain the word.
If the word is a verb, the link Reverso Conjugator is visible, allowing you to see its conjugations.
With the links to Merriam-Webster's, SpanishDict and Google Translate you can verify the word