What words are called content?
Also, what are content words and function words?
That's because content words (e.g., words that carry the most meaning in sentences, such as nouns, verbs, adjectives, and adverbs) typically receive stress in phrases, while function words (e.g., words that have very little meaning, such as prepositions, articles, pronouns, and auxiliary verbs) do not.
Herein, is Blue a content word?
Content words (in blue) are further classified into Nouns, Verbs, Adjectives and Adverbs. There are tens of thousands of them in a language and so they make up most of the words in a dictionary. Proper nouns (names of people and places) are not usually a problem for understanding, but are also Content Words.
Content words are words that have meaning. Therefore, we refer to function words as a "closed" class. Pronouns, prepositions, conjunctions, determiners, qualifiers/intensifiers, and interrogatives are some function parts of speech.