What's the difference between 'comprise' and 'compose'?

Question

Accepted Answer

**Comprise = to consist of; the whole comprises the parts**
- "The committee comprises twelve members." (the committee = 12 members)
- "The UK comprises four nations."
- Direction: whole → parts.

**Compose = to make up; the parts compose the whole**
- "Twelve members compose the committee." (12 members = the committee)
- "Four nations compose the UK."
- Direction: parts → whole.

**Memory trick:** The whole COMPRISES the parts. The parts COMPOSE the whole.

**"Is comprised of":** Controversial. Strictly speaking, "the committee is comprised of twelve members" is considered incorrect by purists (you wouldn't say "the committee is consisted of"). The correct form is "the committee comprises twelve members" or "is composed of twelve members."

**The honest truth:** "Is comprised of" is used so widely — even in quality publications — that it's effectively accepted in standard usage. In formal legal or academic writing, avoid it. In most other contexts, it's fine.

**Tags:** grammar, formal writing, vocabulary, comprise vs compose