90% of the time, speakers of English use just 7,500 words in speech and writing. These words appear in red, and are graded with stars. One-star words are frequent, two-star words are more frequent, and three-star words are the most frequent.
The thesaurus of synonyms and related words is fully integrated into the dictionary. Click on the thesaurus category heading under the button in an entry to see the synonyms and related words for that meaning.
Theirs is used as a possessive pronoun, being a possessive form of they.
It can refer to a singular or plural noun, and it can be the subject, object, or complement of a verb or the object of a preposition: Our cat is dark grey, but theirs is black. ♦ Our children are definitely better behaved than theirs.