Noun and Part of speech

Noun noun - A content word that can be used to refer to a person, place, thing, quality, or action.

Part of speech and noun are semantically related in grammar topic. In some cases you can replace phrase "Part of speech" with "Noun", this terms are similar.

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

Noun and part of speech are semantically related in grammar topic. Sometimes you can replace term "Noun" with "Part of speech", this terms are similar.