À. Ashton divides the lexicon into three parts: notional words, relational words and interstitial words.
Notional words are to give the right perception of some thing, process or property. Under notional he understands the nouns, qualitative adjectives and verbs.
Relational words neither describe nor name the things, they are just to define their relations and connections towards other things (substantivized pronouns, qualitative and pronominal adjectives).
The adverbs are divided into a separate class known as interstitial words because of their being partly notional(wisely, brightly) and partly relational (now, thus)
II. A West’s classification
À. West divides the lexicon into three parts, known as declinables, indeclinables and interstitial lwords.
Under declinables he understands all the words that may change their forms. Here belong N, Adj, Pr, V.
Under indeclinables he understands all the words that can’t change their forms. Here belong Prep, Conj. Interj..
The adverbs are divided into a separate class known as interstitial words because of can be both declinable and indeclinable.
III. P. Penns and D. Ameri’s classification
They divide the lexicon into four parts
1.the words that name — substantives (N+Pr)
2.the words that define (Adj+Adv);
3.the words that state (V)
4.the words that connect (Prep+Conj.)
IV Popabekker‘s classification
He He divides the lexicon into four parts according to their functions in a sentence:
1. Statement words: the nouns, the verbs, the pronouns
2. Modifying words: the adjectives, the adverbs.
3. Connecting words: the prepositions, conjunctions
4. Independent words: interjections.
V. J. Grattan and P. Perri ‘s classification
They divide the lexicon into 2 parts according to the grammatical meaning and their functions in a sentence:
1) full words, which have individual lexical meaning, even taken separately, out of any context
2) formal words, which don’t have any lexical meaning
VI. O. Espersen.’s classification
They divide the lexicon into three parts according to their functioning in such syntactical structures as a word-combination and a sentence. This division of the lexicon is based on his three ranks theory «òðåõ ðàíãîâ». So he distinguishes :
1. theprimary words, which may be seen as the core of a word-combination or the subject of a sentence;
2. the secondary words(graduates), which are dependant on the primary word, characterizing as its atrribute;
3. the tertiary words (sub-graduates), which are dependant on the graduates. In most cases sub-graduates are to define graduate.
Notional parts of speech
proper —commonanimate and inanimatehuman and non-humancountable and uncountable