With "loqu":
* Loquacious: (adjective) tending to talk a great deal; talkative
* Eloquence: (noun) fluent or persuasive speaking or writing
* Eloquent: (adjective) fluent or persuasive in speaking or writing
* Grandiloquent: (adjective) using high-flown or bombastic language
* Circumlocution: (noun) the use of many words where fewer would do, especially in a deliberate attempt to avoid saying something directly
* Soliloquy: (noun) an act of speaking one's thoughts aloud when by oneself or regardless of any hearers, especially by a character in a play
* Loquacity: (noun) the quality of talking a great deal; talkativeness
With "locu":
* Locution: (noun) a way of speaking or writing; a particular phrase or expression
* Locutory: (adjective) relating to speech or speaking
* Interlocutor: (noun) a person who takes part in a conversation or dialogue
* Collocation: (noun) the occurrence of two or more words together in a way that is not random; a phrase or expression
These words all come from the Latin word "loqui" meaning "to speak".