Part of speech and Syntactic category

Part of speech noun - One of the traditional categories of words intended to reflect their functions in a grammatical context.

Syntactic category and part of speech are semantically related. In some cases you can use "Syntactic category" instead a noun phrase "Part of speech".

Syntactic category noun - (grammar) a category of words having the same grammatical properties.

Part of speech and syntactic category are semantically related. Sometimes you can replace phrase "Part of speech" with "Syntactic category", this phrases are similar.