It coud mean that the word is a plural possessive, such as in "Cows' ". It could also mean that the word has been clipped, such as in "Good mornin' ", where the velar nasal sound "ng" has been shortened to just an "n".
a twang.... mostly annoyin nasal tones...
Nasal is the root word of nasal. There is no prefix or suffix.
Nasal.
Snot
(liquid) nasal mucus; nasal discharge; pituita; snot;
sinus
nostril
That is 'nasal'
nose
Clear nasal mucus or, "snot", is usually associated with allergies. If your nasal mucus is green or yellow you may have an infection and should see a doctor.
This question needs to be more specific. I assume that you mean a nasal spray with a medication, and there are different types of drugs that are made and administered as nasal sprays.