The difference between Part of speech and Word class
When used as nouns, part of speech means a linguistic category of words sharing syntactic or morphological behaviour and semantic properties, such as noun or verb, whereas word class means a linguistic form class whose members are words.
check bellow for the other definitions of Part of speech and Word class
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Part of speech as a noun (grammar):
A linguistic category of words sharing syntactic or morphological behaviour and semantic properties, such as noun or verb.
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Word class as a noun (linguistics):
A linguistic form class whose members are words.