Answer:
Spellzone can be used to teach English spelling in schools, colleges, language schools and by ... unstressed vowel sound, called the schwa (see unit 24).
Step-by-step explanation:
What are schwa words examples?
A schwa is a vowel sound in an unstressed syllable, where a vowel does not make its long or short vowel sound. It usually sounds like the short /u/ sound, but is softer and weaker.
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Examples of a schwa:
a: balloon.
e: problem.
i: family.
o: bottom.
u: support.
y: analysis.