Head lice is actually already the plural form. The singular is head louse.
The plural is heads of state
The plural of disc jockey is disc jockeys. As in "the disc jockeys went head-to-head in the challenge".
If you're referring to more than one head for a single school, the plural is 'heads of school'. If you're referring to one person head for more than one school, the plural is 'head of schools'. If you're referring to more than one person as head of more than one school, the plural is 'heads of schools'.
The word "head" can function as a noun, a verb, or an adjective depending on how it is used in a sentence. It can refer to the upper part of the body, the act of leading or directing, or something located at the front or top.
Singular: He bangs on your head.Plural: They bang on your head.
Brains is both a plural usage of the word, and slang terminology to imply hitting someone about the head.
Hairs. As in, the hairs on my head are aqua colored.
The plural of carnifex is carnifex. like sheep and sheep. "There is a flock of sheep on the hillside" "There are some carnifex coming to rip your head off"
Yes it is. Plural: Heads of lettuce Singular: Head of lettuce
The correct phrase is "Off the top of their head."
A pater familias (father of the family) was the head of the family/household. The plural is patres familias.