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i think the origin of the word paragraph is greek?
You may be looking for a paragraph.
sub-paragraph
The stress syllable in the word "paragraph" is the first syllable, "par."
. . . Paragraph, anyone? ;-)
The first word in a paragraph does not have a specific name; it's just the first word.
no or at least not any more than i capitalize the word sentence in a paragraph
"However" is a clue word that often indicates a contrast in a paragraph.
paragraph formatting
The first paragraph of my essay was about the book.
Creating paragraph is a part of typing so yes, it belongs to word processing.
A definition paragraph would be one that offers a definition of a word or idea. The paragraph should be at least two sentences long, should state the word being defined, and give the answer.