One type of context clue uses one or more synonyms to restate the meaning unfamiliar word?

That's correct! The type of context clue you're describing is called a synonym clue.

Here's how it works:

* The author uses a word or phrase that means the same thing as the unfamiliar word.

* This helps the reader understand the unfamiliar word's meaning without having to look it up in a dictionary.

Example:

"The arduous climb up the mountain was a challenge, but the view from the top was worth the effort. "

In this sentence, "worth the effort" is a synonym clue for "arduous," indicating that the climb was difficult.