155 Words for Tone Plus How to Tell Voice from Tone

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What is tone? 

Tone refers to an author’s use of words and writing style to convey his or her attitude towards a topic. Tone is often defined as what the author feels about the subject. What the reader feels is known as the mood.

Tip: Don’t confuse tone with voice. [Read How Do You Find Your Writing Voice?] Voice can be explained as the author’s personality expressed in writing. Tone = Attitude. Voice = Personality.
Tone (attitude) and voice (personality) create a writing style. You may not be able to alter your personality but you can adjust your attitude. This gives you ways to create writing that affects your audience’s mood.

And a definition by Richard Nordquist:

In Writing: A Manual for the Digital Age (2012), Blakesley and Hoogeveen make a simple distinction between style and tone: "Style refers to the overall flavor and texture created by the writer's word choices and sentence structures. Tone is an attitude toward the events of the story—humorous, ironic, cynical, and so on." In practice there's a close connection between style and tone.