Postrate and nutrial disturbulances

All of the words in the title are "words" students said in class last week:

• "postrate" instead of "posture"
• "nutrial" instead of "nutritious"
• "disturbulances" instead of "disturbance"

 A question I often get is "Should I say a word even if I'm not 100% sure of what it means?"

If you recognize it as a key word in the conversation or lecture, and if you can get reasonably close to the correct pronunciation, then YES, you should. The reason is that you want to demonstrate to the raters that you understood it to be an important detail. I think all of the above are close enough.

Please use English well!