Yes, "nine-year-old" is a compound adjective. It combines the number "nine," the noun "year," and the suffix "-old" to describe the age of a person or thing. When used in a sentence, it typically hyphenates to clarify that it describes age, such as in "a nine-year-old child."
Upwards is a compound word.
Compound adjectives are only compound before the noun.
The compound word of after is afternoon,
compound words
is it compound
It is a compound.
Water is a compound
Compound.
Compound
compound
The noun rowboat is a closed compound.
A compound angle.A compound angle.A compound angle.A compound angle.
Peach is a compound
Compound
If there's more than just silicon in the compound, it's a compound
No Its an ionic compound
This compound is the chromium phosphate.