In English, as in many other languages, you can make new words by combining two words.
Here are some examples:
1 lighthouse – made from light and house
A lighthouse is the tower with a strong lamp on top that warns ships to stay off the coast.
But a light colour is not a compound word. Here, light just means that the colour is closer to white than to black.
Light can also mean not heavy.
Lightweight is a compound word. A lightweight is someone who doesn’t weigh a lot. This term is used in sports such as boxing, judo or weightlifting where it matters how heavy you are. There is also middleweight and heavyweight.
But a light meal is not a compound word. A meal can also be heavy or healthy, etc.
2 Software is a compound word. They are the programs that your computer or phone uses.
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