The phrase "facility of speech" refers to the ease and fluency with which someone can communicate verbally. There are several synonyms that can be used in place of this phrase, including eloquence, articulateness, glibness, fluency, and volubility. These words all describe a person's ability to express themselves clearly and confidently through spoken language. Another related term is the gift of gab, which refers to someone who has a natural talent for speaking and can easily hold a conversation or persuade others with their words. Overall, facility of speech is an important skill for effective communication, and these synonyms can help to expand one's vocabulary when discussing this topic.