Topic vs. Heading

The subject of a speech, essay, thesis, or discourse.

The title, subtitle, or topic that stands at the top or beginning, as of a paragraph, letter, or chapter.

A subject of discussion or conversation.

The course or direction in which a ship or aircraft is pointing or moving.

A subdivision of a theme, thesis, or outline.

A gallery or drift in a mine.

(Linguistics) A word or phrase in a sentence, usually providing information from previous discourse or shared knowledge, that the rest of the sentence elaborates or comments on. Also called theme.

The end of a gallery or drift.

Topical

Present participle of head

Subject; theme; a category or general area of interest.

The title or topic of a document, article, chapter, or of a section thereof.

(Internet) Discussion thread.

(nautical) The direction into which a seagoing or airborne vessel's bow is pointing (apparent heading) and/or the direction into which it is actually moving relative to the ground (true heading)

(music) A musical sign intended to suggest a particular style or genre.

Material for the heads of casks, barrels, etc.

(obsolete) An argument or reason.

(mining) A gallery, drift, or adit in a mine; also, the end of a drift or gallery; the vein above a drift.

An external local application or remedy, such as a plaster, a blister, etc.

(sewing) The extension of a line ruffling above the line of stitch.

One of the various general forms of argument employed in probable as distinguished from demonstrative reasoning, - denominated by Aristotle to`poi (literally, places), as being the places or sources from which arguments may be derived, or to which they may be referred; also, a prepared form of argument, applicable to a great variety of cases, with a supply of which the ancient rhetoricians and orators provided themselves; a commonplace of argument or oratory.

(masonry) The end of a stone or brick which is presented outward.

An argument or reason.

(flags) A strip of material at the hoist end of a flag, used for attaching the flag to its halyard.

The subject of any distinct portion of a discourse, or argument, or literary composition; also, the general or main subject of the whole; a matter treated of; a subject, as of conversation or of thought; a matter; a point; a head.

The act or state of one who, or that which, heads; formation of a head.

An external local application or remedy, as a plaster, a blister, etc.

That which stands at the head; title; as, the heading of a paper.

Topical.

Material for the heads of casks, barrels, etc.

The subject matter of a conversation or discussion;

A gallery, drift, or adit in a mine; the vein above a drift.

Some situation or event that is thought about;

The extension of a line ruffling above the line of stitch.

That end of a stone or brick which is presented outward.

A line of text serving to indicate what the passage below it is about;

The direction or path along which something moves or along which it lies

A horizontal (or nearly horizontal) passageway in a mine;