Content words
Content and Function words:
Some words have more than just a grammatical meaning.
Content words
Content words in English have meaning. They are words like "flat," "internet," and "happiness."
Function words
Function words, on the other hand, only have meaning in grammar. These are words like "the" "than" and "with."
Pronunciation
Pronunciation may change when you use content or function words. For example, the th in the function word though /'ðoʊ/ is pronounced differently from the content word theory /'θɪəri/.