Which one is a compound noun?

Explanation: • Hair-brush is a compound noun.
-  যা hair (চুল) এবং brush (ব্রাশ) এ দুটি noun নিয়ে গঠিত।স
• Compound Nouns:
- A compound noun is a noun that is made with two or more words.
- অর্থাৎ দুই বা ততোধিক শব্দ নিয়ে যে noun গঠিত হয় সেগুলোকে compound noun বলা হয়।
- A compound noun is usually [noun + noun] or [adjective + noun], but there are other combinations. Each compound noun acts as a single unit and can be modified by adjectives and other nouns.

There are three forms for compound nouns:
1. open or spaced - space between words (tennis shoe)
2. hyphenated - hyphen between words (six-pack)
3. closed or solid - no space or hyphen between words (bedroom)