a class of words that all share similar morphological and syntactic properties -- that is, words that may appear in the same morphological and syntactic frames

a syntactic category for elements that are part of the lexicon of a language

The Lexical category is made up of substantive Nouns/Verbs/Adjectives/Adverb s. This category is void of any Functional Inflection.

Every word in the language belongs to some lexical category, that is, instances some part of speech. Thus, `dog', `brain', and `syllogism', for example, all belong to the lexical category `noun'.

In grammar, a lexical category (also word class, lexical class, or in traditional grammar part of speech) is a linguistic category of words (or more precisely lexical items) that are usually defined by their particular syntactic or morphological behaviours. Common linguistic categories include noun and verb, among others. There are open word classes, which constantly acquire new members, and closed word classes, which acquire new members infrequently if at all.