A hyphen is used to separate the words and numbers.
Ex: two-headed lizard, three-layered cake, four-bedroom house, five-minute workout
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Toolbox is a compound word.
The use of these two words together can be considered a compound noun. When the use of two or more words together to form a noun with its own meaning is used frequently enough, it is considered a compound noun.
Numbers are used to indicate the valency of the metal in the compound. By convention Roman numerals are used so that the number isn't mistakenly confused with the numbers present in the formula.
No. A compound word is one that is formed from two separate words, but has a specific meaning that may be different from the two separate words used together. Examples are grandfatherand stopwatch.
No. A compound word is one that is formed from two separate words, but has a specific meaning that may be different from the two separate words used together. Examples are grandfatherand stopwatch.