Verbals have the category of aspect, tense, correlation and voice (Ilyish B. A.)

verb

"Some" is classified as a determiner in English grammar. It is used to specify an unspecified quantity or number of something.

The idea of parts of speech has to do with grammatical categories such as nouns and verbs and adjectives. It does not include synonyms. Synonyms are words (and in that sense, they are literally parts of speech) but they do not form a grammatical category. They are just a category of words that is used to help understand what words mean, or to help you to find alternative ways of saying something, to avoid being repetitious or cliche.

A lexical affix is a morpheme that attaches to a base word to create a new word with a different meaning or function. Unlike grammatical affixes, which primarily affect the grammatical structure of a word, lexical affixes bring about changes in the meaning or lexical category of the word.