The vowel sound in "wash" is the /ɑ/ sound, also known as the open back unrounded vowel.

The vowel sound in "ego" is the "ee" sound, which is a close front unrounded vowel.

The vowel sound in "nose" is the open-mid back unrounded vowel, represented by the symbol /o/. It is a rounded vowel produced with the tongue placed in the back of the mouth.

The accented syllable in the word "except" is the second syllable, of which the vowel is an open-mid front unrounded vowel, represented in IPA as /ɛ/. The entire pronunciation of except is /ik-sept/ (transcribed in IPA as /ɪkˈsɛpt/.

The vowel sound in "meal" is the long e sound like in "see" or "beak".