Adjective (2 facts) - One of the parts of speech. The Class of Words that conventionally denote Attributes of Objects
Adverb (2 facts) - One of the parts of speech. The Class of Words that conventionally denote Attributes of Processes
Noun (2 facts) - One of the parts of speech. The Class of Words that conventionally denote Objects
Particle (2 facts) - An umbrella Class for any Word that does not fit into the other subclasses of Word. A Particle is generally a small term that serves a grammatical or logical function, e.g. 'and', 'of', 'since', etc. At some point, this class might be broken up into the subclasses 'Connective', 'Preposition', etc
Verb (2 facts) - One of the parts of speech. The Class of Words that conventionally denote Processes