NOT A TEACHER
Boss and gross are pronounced differently. To support this claim, here's the phonetic transcript from the Longman Dictionary of Contemporary English .
boss 1 S2 W3 / bɒs $ bɒːs / noun [ countable ]
gross 1 S3 / ɡrəʊs $ ɡroʊs / adjective
The prononciation is quite different, I know this from experience as well.
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