Here's why:
* Compound words are formed by combining two or more words, often creating a new meaning. For example, "sunlight" is a compound word because it combines "sun" and "light".
* Historical and contemporary are single words that have evolved from their root nouns. They are not formed by combining words together.
Example:
* Historical event: This refers to an event that occurred in the past.
* Contemporary art: This refers to art that is created in the present time.
In both cases, the words "historical" and "contemporary" are single, descriptive terms.