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Strikethrough
Strikes through the selected text if it’s not already struck through, and not struck through if it’s already struck through. Strikethrough only applies to selected text; it doesn’t apply to whole Text Areas.

By Word
Enabled only if the selected text is underlined or struck through. Elliminates underlining or striking through on the spaces between words.
Bigger/Smaller
Makes the current selected text one point size larger or smaller.
Kern
Use Default: Makes current selected text use its default kerning.
Use None: Makes the current selection use no kerning.
Tighten: Makes the letters in the current selection closer together.
Loosen: Makes the letters in the current selection further apart.