A compound word is a word formed by combining two or more individual words to create a new word with a distinct meaning. The resulting word can be written as a single word, hyphenated, or as separate words, depending on the language and usage rules. Compound words often convey a specific concept that is related to, but different from, the meanings of the individual words.

Examples of Compound Words:

1. Closed (Single Word):

   • Sunflower (sun + flower)

   • Notebook (note + book)

   • Basketball (basket + ball)

2. Hyphenated:

   • Mother-in-law

   • Well-being

   • Check-in

3. Open (Separate Words):

   • Post office

   • Ice cream

   • High school

Types of Compound Words:

1. Noun Compounds:

   • Toothbrush (tooth + brush)

   • Raincoat (rain + coat)

2. Adjective Compounds:

   • Blue-eyed (blue + eyed)

   • Long-term (long + term)

3. Verb Compounds:

   • Overcome (over + come)

   • Underestimate (under + estimate)