Synonyms are words that are the same or similar to the word. If you don’t know a word, but you know what it’s synonym means, then you know what the word means.
Synonyms can help you determine the meaning of an unfamiliar word because they have the same meaning as the word
It shows the love his dad has for him and his trust in his son.
Look at THOSE cool looking shoes!
THOSE boxes look heavy.
Are you sure THOSE are the right boxes?