the answer is Antonyms
A "synonym" of a word is one that can have the same or a similar meaning.
This is an ambiguous question. It is not clear whether you are looking for words that have a similar sound, or a similar meaning to the word family. In terms of sound, familial sounds rather similar. In terms of meaning, clan, or relatives has a similar meaning.
Representative has a similar meaning to iconic.
similar in meaning to expedite.
A similar meaning to masticate is the word: chew.
different word similar to ambigious
'Cube' is a similar word,but with a totally different meaning
Synonym
A similar meaning of the word avoid is to stay away from or hide from.
That is called a synonym.
Grade?
The word is infinite.