Etymology
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Words related to head

*kaput- 
Proto-Indo-European root meaning "head."

It forms all or part of: achieve; behead; biceps; cabbage; cabochon; caddie; cadet; cap; cap-a-pie; cape (n.1) "garment;" cape (n.2) "promontory;" capital (adj.); capital (n.3) "head of a column or pillar;" capitate; capitation; capitulate; capitulation; capitulum; capo (n.1) "leader of a Mafia family;" capo (n.2) "pitch-altering device for a stringed instrument;" caprice; capsize; captain; cattle; caudillo; chapter; chef; chief; chieftain; corporal (n.); decapitate; decapitation; forehead; head; hetman; kaput; kerchief; mischief; occipital; precipice; precipitate; precipitation; recapitulate; recapitulation; sinciput; triceps.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit kaput-; Latin caput "head;" Old English heafod, German Haupt, Gothic haubiþ "head."
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heading (n.)
c. 1300, "a beheading," from present participle of head (v.). Meaning "an advancing in a certain direction" is from c. 1600. Meaning "title at the head of a portion of text" is from 1849.
ahead (adv.)
1620s, "at the head, in front," from a- "on" (see a- (1)) + head (n.) "front." Originally nautical (opposed to astern). Meaning "forward, onward" (the sense in go ahead) is from 1640s. To be ahead of (one's) time attested by 1837.
airhead (n.)

"empty-headed person," 1972, from air (n.1) + head (n.). Earlier as a term in mining (mid-19c.) and as a military term (1950) based on beach-head.

arrow-head (n.)
also arrowhead, late 15c., from arrow + head (n.). Ancient ones dug up were called elf-arrows (17c.).
ass-head (n.)
also asshead, "stupid person, dullard," late 15c., asse hede, from ass (n.1) + head (n.). Related: Ass-headed.
baldhead (n.)
"bald-headed man," 1530s, from bald + head (n.). Also baldpate (c. 1600).
beach-head (n.)
also beachhead, 1940, in reference to German military tactics in World War II, from beach (n.) + head (n.), on the model of bridgehead, but the image doesn't quite work.
blackhead (n.)
"comedo," 1837, from black (adj.) + head (n.). So called for its appearance.
blockhead (n.)
also block-head, "stupid person," 1540s (implied in blockheaded), from block (n.1) + head (n.); probably originally an image of the head-shaped oaken block used by hat-makers, though the insulting sense is equally old.