distal demonstrative, something far off removed from both speaker and listener: that, yon / particularly, male personal third person pronoun: he / by extension from he: boyfriend

he; boyfriend

to use one's head

use one thing for many purposes / work someone hard

(religion) nail that was used to crucify Jesus Christ

(idiomatic, figuratively) to give a warning, to remind a person of

having no effect

a surname

nailhead, head of a nail

(colloquial) current boyfriend