Can the grammar terms, the words 'subject' and 'object', be used as uncountable nouns?

Occasionally, articles are omitted altogether before certain nouns. In these cases, the article is implied but not actually present. This implied article is sometimes called a “zero article.” Often, the article is omitted before nouns that refer to abstract ideas. This is not to mean that those ideas are not countable. It would be prudent to consider the grammar terms like "subject/object etc" as common nouns, contextually specific or unspecific.. generalization is a broad statement or an idea that can be applied to a whole group of people or things. When we generalize, we omit articles. As

• Man is mortal.

If you are squeamish, you would demand an article , here"a" before man. The result would be disastrous giving a wrong signal to the reader suggesting you have a certain man in mind, the referred one who is mortal. SUBJECT/OBJECT are naming of concepts of grammar and can be used without article(s) in such situations where generalisation is involved. Please remember that uncountable nouns are those nouns that are not generally counted.