head: the top part of the body, and by extension the topmost, foremost, or most prominent part of anything, including the leading member of a group
At its core this word names the head on a person's or animal's body, the part you anoint, strike, bow, cover, or shake. The New Testament uses it that way constantly, from the hairs of the head being numbered to the crown of thorns to John the Baptist's head carried in on a platter.
Because the head sits at the top and is the most noticeable part of the body, the same word stretches in two natural directions. One is spatial: the head of the corner is the prominent stone at the joining of two walls, the piece the whole structure turns on. The other is relational: a head is the foremost member of a body, a household, or a people, the one the rest look to and are joined to.
These are not separate words but one picture used in different settings, and the shared thread is prominence: the head is the uppermost, most visible, most representative part. What that prominence implies in a given passage varies.
- Sometimes it clearly carries authority, as when Christ is set as head over all things for the church.
- Sometimes it clearly carries the idea of source, as when the whole body is said to grow out of the head.
- Often the surrounding words, not the term itself, tell you which.
A reader who keeps the plain picture in view, the highest and most prominent part on which the rest depends, will follow each use without forcing one fixed English sense onto them all.